Message-ID: <CAGnVnB=scn13bE-+0xn4cqYnStObN+VvSMv4bL3whvRzXv1dFw@mail.gmail.com>
Date:	Fri, 10 Feb 2012 19:05:49 -0500
From:	sridhar basam <sri@...am.org>
To:	Jim Schutt <jaschut@...dia.gov>
Cc:	ceph-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 0/6] Understanding delays due to throttling under very
 heavy write load

On Fri, Feb 10, 2012 at 6:09 PM, Jim Schutt <jaschut@...dia.gov> wrote:
>
> [ added Cc:netdev
>  See http://www.spinics.net/lists/ceph-devel/msg04804.html
>  for the start of the thread.
>  -- Jim
> ]
>
>
> On 02/10/2012 10:13 AM, sridhar basam wrote:
>>
>> On Fri, Feb 10, 2012 at 10:32 AM, Jim Schutt<jaschut@...dia.gov>  wrote:
>>>
>>> On 02/09/2012 06:26 PM, sridhar basam wrote:
>>>>
>>>>
>>>> Do you mind capturing to a pcap file and providing that. Makes it
>>>> easier to analyse things. If not, i understand. If you can make do the
>>>> capture on both ends, do it with a snaplen of 68 so that you get all
>>>> of the headers and there shouldn't be too much payload information in
>>>> the file.
>>>
>>>
>>>
>>> I've got a pcap file for this run for this client, with snaplen 128
>>> (I thought I might need to look for ceph message headers).  It's 13 MB
>>> compressed.  How shall I get it to you?
>>>
>>
>> Can i grab it off some webserver you control? Or you can temporarily
>> drop it into docs.google.com and add accesss from my email account?
>
>
> I tabled this for the moment while I worked on collecting
> packet traces from both ends.  But you'll probably want
> to see the pcap files for what I'm about to show.  Also,
> I think I need to add netdev to this discussion ...
>
>
>>
>>> In the meantime, I'll try to capture this from both sides.
>
>
> Here's another example, captured from both sides, with
> TSO/GSO/GRO all off, snaplen 68.
>
> This was captured from the client side.  Same pattern, in
> that the client sends many retransmits over a period of
> a couple minutes.  It's different in that the client
> seems to give up and reconnect ...
>
> 11:57:35.984024 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18109890, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:35.984032 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18112786:18114234, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984038 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18114234:18115682, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984120 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18112786, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:35.984129 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18115682:18117130, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984135 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18117130:18118578, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984143 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18115682, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:35.984148 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18118578:18120026, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984153 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984270 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18118578, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:35.984278 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18121474:18122922, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984283 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18122922:18124370, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:35.984420 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:35.984428 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18124370:18125818, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.184945 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.587936 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:37.393937 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:39.003937 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:42.227933 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:48.675931 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:58:01.555935 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:58:27.347945 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:59:18.867935 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 12:00:22.673029 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [P.], seq
> 863:1036, ack 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 12:00:22.712933 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], ack
> 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:01:02.035951 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:03:02.355941 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:05:02.675947 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:07:02.995943 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:09:03.315942 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:11:03.635948 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:13:03.961655 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [S], seq
> 1551304795, win 14600, options [mss 1460,[|tcp]>
> 12:13:03.961722 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [S.], seq
> 2095554319, ack 1551304796, win 14480, options [mss 1460,[|tcp]>
> 12:13:03.961732 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 1, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.961822 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [P.], seq
> 1:201, ack 1, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.961874 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [.], ack
> 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.962070 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [P.], seq
> 1:10, ack 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.962077 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 10, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.962370 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [P.], seq
> 10:282, ack 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.962377 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 282, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.962819 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [F.], seq
> 1036, ack 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 12:13:03.962828 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [R], seq
> 2449506432, win 0, length 0
>
> Here's the same thing, captured from the server side:
>
> 11:57:36.012908 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18109890, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:36.012967 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18109890:18111338, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.012977 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18111338:18112786, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013020 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18112786, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:36.013036 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18112786:18114234, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013039 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18114234:18115682, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013041 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18115682, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:36.013123 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18115682:18117130, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013129 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18117130:18118578, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013155 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18118578, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:36.013163 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18118578:18120026, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013171 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013261 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18121474:18122922, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013281 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [.], ack
> 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 11:57:36.013288 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18122922:18124370, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.013410 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18124370:18125818, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.213941 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:36.617001 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:37.422996 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:39.033018 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:42.257206 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:57:48.705321 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:58:01.585648 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:58:27.378231 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 11:59:18.899063 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 863, win 18760, options [nop,nop,TS[|tcp]>
> 12:00:22.704018 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [P.], seq
> 863:1036, ack 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 12:00:22.744053 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], ack
> 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:01:02.067040 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:03:02.386981 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:05:02.705227 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:07:03.021427 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:09:03.332661 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:11:03.642409 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [.], seq
> 18120026:18121474, ack 1036, win 19832, options [nop,nop,TS[|tcp]>
> 12:13:03.963373 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [S], seq
> 1551304795, win 14600, options [mss 1460,[|tcp]>
> 12:13:03.963389 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [S.], seq
> 2095554319, ack 1551304796, win 14480, options [mss 1460,[|tcp]>
> 12:13:03.963446 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 1, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.963540 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [P.], seq
> 1:201, ack 1, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.963547 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [.], ack
> 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.963700 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [P.], seq
> 1:10, ack 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.963794 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 10, win 14600, options [nop,nop,TS[|tcp]>
> 12:13:03.964024 IP 172.17.131.32.6807 > 172.17.135.4.57628: Flags [P.], seq
> 10:282, ack 201, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.964091 IP 172.17.135.4.57628 > 172.17.131.32.6807: Flags [.], ack
> 282, win 15544, options [nop,nop,TS[|tcp]>
> 12:13:03.964438 IP 172.17.131.32.6807 > 172.17.135.4.57589: Flags [F.], seq
> 1036, ack 18120026, win 5792, options [nop,nop,TS[|tcp]>
> 12:13:03.964542 IP 172.17.135.4.57589 > 172.17.131.32.6807: Flags [R], seq
> 2449506432, win 0, length 0
>
> So if I'm reading this right, the client and server agree that
> the server ACKed 18120026 twice.  The client and server also
> agree that the client retransmitted 18120026:18121474 nine times
> from 11:57:36.213941 through 11:59:18.899063 (server clock).
>
> But the server never ACKed that packet.  Too busy?
>
> I was collecting vmstat data during the run; here's the important bits:
>
> Fri Feb 10 11:56:51 MST 2012
> vmstat -w 8 16
> procs -------------------memory------------------ ---swap-- -----io----
> --system-- -----cpu-------
>  r  b       swpd       free       buff      cache   si   so    bi    bo   in
>   cs  us sy  id wa st
> 13 10          0     250272        944   37859080    0    0     7  5346 1098
>  444   2  5  92  1  0
> 88  8          0     260472        944   36728776    0    0     0 1329838
> 257602 68861  19 73   5  4  0
> 100 10          0     241952        944   36066536 0 0     0 1635891 340724
> 85570  22 68   6  4  0
> 105  9          0     250288        944   34750820 0 0     0 1584816 433223
> 111462  21 73   4  3  0
> 126  3          0     259908        944   33841696    0    0     0 749648
> 225707 86716   9 83   4  3  0
> 157  2          0     245032        944   31572536 0 0     0 736841 252406
> 99083   9 81   5  5  0
> 45 17          0     246720        944   28877640    0    0     1 755085
> 282177 116551   8 77   9  5  0

Holy crap! That might explain why you aren't seeing anything. You are
writing out over a 1.6 million blocks/sec. That too averaged over a 8
second interval. I bet the missed acks are when this is happening.
What sort of I/O load is going through this system during those times?
What sort of filesystem and Linux system are these OSDs on?

 Sridhar



> 27  5          0     260556        944   27322948    0    0     0 553263
> 232682 132427   7 68  19  6  0
>  4  0          0     256552        944   26507508    0    0     0 271822
> 133540 113952   5 15  75  5  0
>  4  3          0     235236        944   26308308    0    0     0 181450
> 96027 101017   4 10  82  4  0
>  4  2          0     225372        944   26072048 0 0     0 200145 97401
> 100146   4 11  80  5  0
>  7  1          0     250940        944   25974752    0    0     0 92943
> 64015 78035   3  7  87  2  0
>  2  1          0     261712        944   25886872    0    0     0 152351
> 80963 99512   4  9  84  4  0
>  4  1          0     265056        944   25850216    0    0     0 92452
> 60790 75949   3  7  87  2  0
>  0  0          0     269164        944   25857592    0    0     0 87396
> 52994 67057   3  7  88  3  0
>  6  2          0     263672        944   25846192    0    0     0 110817
> 67707 75849   3  8  86  3  0
> Fri Feb 10 11:58:51 MST 2012
> vmstat -w 8 16
> procs -------------------memory------------------ ---swap-- -----io----
> --system-- -----cpu-------
>  r  b       swpd       free       buff      cache   si   so    bi    bo   in
>   cs  us sy  id wa st
>  1  2          0     260620        944   25838996    0    0     6  7199  240
>  795   3  8  88  1  0
>  1  0          0     262124        944   25838936    0    0     0 108113
> 64640 75751   3  7  87  3  0
>  1  0          0     258700        944   25850148    0    0     0 94477
> 57952 68787   3  7  88  3  0
>  0  1          0     270144        944   25794068    0    0     0 92113
> 54901 73329   3  6  88  2  0
>  2  2          0     272036        944   25768044    0    0     0 57449
> 45552 61373   3  5  90  2  0
>  1  1          0     270024        944   25832600    0    0     0 47651
> 44594 60577   2  5  91  1  0
>  1  0          0     280648        944   25862304    0    0     1 54773
> 42668 58636   2  6  90  2  0
>  1  1          0     272132        944   25848136    0    0     0 41938
> 42310 57425   3  6  91  1  0
>  2  0          0     291272        944   25806644    0    0     1 41896
> 42259 58833   2  5  91  1  0
>  0  0          0     289392        944   25804128    0    0     0 32031
> 36699 51119   2  5  92  1  0
>  2  1          0     288420        944   25824956    0    0     0 42997
> 40542 55109   2  5  91  1  0
>  2  0          0     289076        944   25832792    0    0     0 31843
> 36438 49974   2  4  92  1  0
>  1  1          0     294600        944   25795512    0    0     0 35685
> 39307 56293   2  5  92  1  0
>  3  1          0     268708        944   25937656    0    0     0 148219
> 79498 87394   4  8  85  3  0
>  2  0          0     300100        944   25928888    0    0     0 87999
> 59708 73501   3  6  88  2  0
>  1  0          0     279988        944   25966636    0    0     0 71014
> 52225 69119   3  6  90  2  0
>
> So the server might have been busy when 18120026:18121474 was first
> received, but it was nearly idle for several of the retransmits.
>
> What am I missing?
>
>
>>>
>>>
>>>>
>>>> I will take a look at the additional output and see if anything pops
>>>> out. I am assuming the below output was immediately after what you
>>>> posted in your earlier email.
>>
>>
>> i don't see anything out of the ordinary once things recover, the
>> sender even starts to do TSO after a short while.
>
>
> That's what I thought as well.
>
> Thanks -- Jim
>
>
>>
>>  Sridhar
>>
>>
>>>
>>>
>>> Yes.
>>>
>>> Thanks -- Jim
>>>
>>>
>>>>
>>>>
>>>>  Sridhar
>>>>
>>>
>>>
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>>
>>
>>
>
>
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