netdev - Re: 3.4.1 and 3.5-rc1 Packet lost at 250Mb/s

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Message-ID: <80bb011e8f1289218087633fd7b115ea@justnet.pl>
Date:	Mon, 08 Oct 2012 12:49:53 +0200
From:	Nieścierowicz Adam <adam.niescierowicz@...tnet.pl>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: 3.4.1 and 3.5-rc1 Packet lost at 250Mb/s

W dniu 08.10.2012 11:47, Eric Dumazet napisał(a):

> On Mon, 2012-10-08 at 11:29 +0200, Nieścierowicz Adam wrote:
>
>>> You should use RPS on eth2/eth3 because they are non multi queue.
>>> Documentation/networking/scaling.txt should give you all the needed
>>> info
>> I set processors for rps such as affinity, unfortunately it did not
>> help --- cat /sys/class/net/eth{2,3,4,5}/queues/rx-0/rps_cpus 0040 
>> 0080
>> 0100 0200 --- CPU affinity http://wklej.org/id/843161/ [1]
>
> I said eth2 and eth3
>

eth2,eth3 and eth4,eth5 is the same card so I changed them as well, or 
made a mistake?

> And you should use cpu11->cpu15 instead of cpu6->cpu9 since they are 
> in
> use...
>

I read in the file Documentation/networking/scaling.txt
---
if the rps_cpus for each queue are the ones that
share the same memory domain as the interrupting CPU for that queue
---

so i used the same CPU, I misunderstood?


> Anyway you dont say where are drops, (ifconfig give us very few 
> drops)

you can see no losses(drop), but a temporary decline in traffic on the 
interface to 0kb/s

>
> Also your eth0 seems to have a strange balance :
>
> RX interrupts seems to be well balanced on 4 queues :
>
> 76: 503 0 169271690 0 0 0 PCI-MSI-edge eth0-rx-0
> 77: 405 0 0 164532538 0 0 PCI-MSI-edge eth0-rx-1
> 78: 408 0 0 0 152778723 0 PCI-MSI-edge eth0-rx-2
> 79: 349 0 0 0 0 155011301 PCI-MSI-edge eth0-rx-3
> 80: 144 0 443432394 0 0 0 PCI-MSI-edge eth0-tx-0
> 81: 18 0 0 2043311 0 0 PCI-MSI-edge eth0-tx-1
> 82: 30 0 0 0 1934537 0 PCI-MSI-edge eth0-tx-2
> 83: 137 0 0 0 0 1968272 PCI-MSI-edge eth0-tx-3
>
> But TX seems to mostly use queue 0
>
> Packets sent to eth0 are coming from where ?

Packets come mainly from two routers(Edge BGP and local NAT)




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