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Date: Mon, 27 May 2019 14:30:11 -0700
From: Fred Klassen <fklassen@...neta.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Shuah Khan <shuah@...nel.org>,
Network Development <netdev@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
linux-kselftest@...r.kernel.org,
Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net 4/4] net/udpgso_bench_tx: audit error queue
Willem,
Thanks for spending so much time with me on this patch. I’m pretty
new to this, so I know I am making lots of mistakes. I have been
working on a v2 of the selftests in net-next, but want to review the
layout of the report before I submit (see below).
Also, I my v2 fix in net is still up for debate. In its current state, it
meets my application’s requirements, but may not meet all of yours.
I am still open to suggestions, but so far I don’t have an alternate
solution that doesn’t break what I need working.
I also have a question about submitting a fix in net and a related
enhancement in net-next. I feel I should be referencing the fix
in net in my net-next commit, but I don’t know how it should be
done. Any suggestions?
> On May 23, 2019, at 2:56 PM, Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:
>>
>> Example:
>>
>> # ./udpgso_bench_tx -4uT -a -l5 -S 1472 -D 172.16.120.189
>> udp tx: 492 MB/s 8354 calls/s 8354 msg/s
>> udp tx: 477 MB/s 8106 calls/s 8106 msg/s
>> udp tx: 488 MB/s 8288 calls/s 8288 msg/s
>> udp tx: 882 MB/s 14975 calls/s 14975 msg/s
>> Summary over 5.000 seconds ...
>> sum udp tx: 696 MB/s 57696 calls (11539/s) 57696 msgs (11539/s)
>> Tx Timestamps: received: 57696 errors: 0
>>
>> This can be useful in tracking loss of messages when under load. For example,
>> adding the '-z' option results in loss of TX timestamp messages:
>>
>> # ./udpgso_bench_tx -4ucT -a -l5 -S 1472 -D 172.16.120.189 -p 3239 -z
>> udp tx: 490 MB/s 8325 calls/s 8325 msg/s
>> udp tx: 500 MB/s 8492 calls/s 8492 msg/s
>> udp tx: 883 MB/s 14985 calls/s 14985 msg/s
>> udp tx: 756 MB/s 12823 calls/s 12823 msg/s
>> Summary over 5.000 seconds ...
>> sum udp tx: 657 MB/s 54429 calls (10885/s) 54429 msgs (10885/s)
>> Tx Timestamps: received: 34046 errors: 0
>> Zerocopy acks: received: 54422 errors: 0
>
> This would probably also be more useful as regression test if it is in
> the form of a pass/fail test: if timestamps are requested and total
> count is zero, then the feature is broken and the process should exit
> with an error.
I have it set up as a pass/fail test. Below is a sample output of the
test, including a failure on IPv6 TCP Zerocopy audit (a failure that may
lead to a memory leak). I wanted to review the report with you before
I push up the v2 patch into net-next.
Are these extra tests what you were expecting? Is it OK that it doesn’t
flow well? Also, there is a failure about every 3rd time I run it,
indicating that some TX or Zerocopy messages are lost. Is that OK?
ipv4
tcp
tcp rx: 11665 MB/s 189014 calls/s
tcp tx: 11665 MB/s 197859 calls/s 197859 msg/s
tcp rx: 11706 MB/s 190749 calls/s
tcp tx: 11706 MB/s 198545 calls/s 198545 msg/s
tcp tx: 11653 MB/s 197645 calls/s 197645 msg/s
tcp rx: 11653 MB/s 189292 calls/s
tcp zerocopy
tcp rx: 6658 MB/s 111849 calls/s
tcp tx: 6658 MB/s 112940 calls/s 112940 msg/s
tcp tx: 6824 MB/s 115742 calls/s 115742 msg/s
tcp rx: 6824 MB/s 115711 calls/s
tcp rx: 6865 MB/s 116402 calls/s
tcp tx: 6865 MB/s 116440 calls/s 116440 msg/s
tcp zerocopy audit
tcp tx: 6646 MB/s 112729 calls/s 112729 msg/s
tcp rx: 6646 MB/s 111445 calls/s
tcp rx: 6672 MB/s 112833 calls/s
tcp tx: 6672 MB/s 113164 calls/s 113164 msg/s
tcp tx: 6624 MB/s 112355 calls/s 112355 msg/s
tcp rx: 6624 MB/s 110877 calls/s
Summary over 4.000 seconds...
sum tcp tx: 6813 MB/s 451402 calls (112850/s) 451402 msgs (112850/s)
Zerocopy acks: 451402 received 0 errors
udp
udp rx: 914 MB/s 651407 calls/s
udp tx: 925 MB/s 659274 calls/s 15697 msg/s
udp rx: 919 MB/s 654859 calls/s
udp tx: 919 MB/s 654864 calls/s 15592 msg/s
udp rx: 914 MB/s 651668 calls/s
udp tx: 914 MB/s 651630 calls/s 15515 msg/s
udp rx: 918 MB/s 654642 calls/s
udp gso
udp rx: 2271 MB/s 1618319 calls/s
udp tx: 2515 MB/s 42658 calls/s 42658 msg/s
udp rx: 2337 MB/s 1665280 calls/s
udp tx: 2551 MB/s 43276 calls/s 43276 msg/s
udp rx: 2338 MB/s 1665792 calls/s
udp tx: 2557 MB/s 43384 calls/s 43384 msg/s
udp rx: 2339 MB/s 1666560 calls/s
udp gso zerocopy
udp rx: 1725 MB/s 1229087 calls/s
udp tx: 1840 MB/s 31219 calls/s 31219 msg/s
udp rx: 1850 MB/s 1318460 calls/s
udp tx: 1850 MB/s 31388 calls/s 31388 msg/s
udp rx: 1845 MB/s 1314428 calls/s
udp tx: 1845 MB/s 31299 calls/s 31299 msg/s
udp gso timestamp
udp rx: 2286 MB/s 1628928 calls/s
udp tx: 2446 MB/s 41499 calls/s 41499 msg/s
udp rx: 2354 MB/s 1677312 calls/s
udp tx: 2473 MB/s 41952 calls/s 41952 msg/s
udp rx: 2342 MB/s 1668864 calls/s
udp tx: 2471 MB/s 41925 calls/s 41925 msg/s
udp rx: 2333 MB/s 1662464 calls/s
udp gso zerocopy audit
udp rx: 1787 MB/s 1273481 calls/s
udp tx: 1832 MB/s 31082 calls/s 31082 msg/s
udp rx: 1881 MB/s 1340476 calls/s
udp tx: 1881 MB/s 31916 calls/s 31916 msg/s
udp rx: 1880 MB/s 1339880 calls/s
udp tx: 1881 MB/s 31904 calls/s 31904 msg/s
udp rx: 1881 MB/s 1340010 calls/s
Summary over 4.000 seconds...
sum udp tx: 1912 MB/s 126694 calls (31673/s) 126694 msgs (31673/s)
Zerocopy acks: 126694 received 0 errors
udp gso timestamp audit
udp rx: 2259 MB/s 1609327 calls/s
udp tx: 2410 MB/s 40879 calls/s 40879 msg/s
udp rx: 2346 MB/s 1671168 calls/s
udp tx: 2446 MB/s 41491 calls/s 41491 msg/s
udp rx: 2358 MB/s 1680128 calls/s
udp tx: 2448 MB/s 41522 calls/s 41522 msg/s
udp rx: 2356 MB/s 1678848 calls/s
Summary over 4.000 seconds...
sum udp tx: 2494 MB/s 165276 calls (41319/s) 165276 msgs (41319/s)
Tx Timestamps: 165276 received 0 errors
udp gso zerocopy timestamp audit
udp rx: 1658 MB/s 1181647 calls/s
udp tx: 1678 MB/s 28466 calls/s 28466 msg/s
udp rx: 1718 MB/s 1224010 calls/s
udp tx: 1718 MB/s 29146 calls/s 29146 msg/s
udp rx: 1718 MB/s 1224086 calls/s
udp tx: 1718 MB/s 29144 calls/s 29144 msg/s
udp rx: 1717 MB/s 1223464 calls/s
Summary over 4.000 seconds...
sum udp tx: 1747 MB/s 115771 calls (28942/s) 115771 msgs (28942/s)
Tx Timestamps: 115771 received 0 errors
Zerocopy acks: 115771 received 0 errors
ipv6
tcp
tcp tx: 11470 MB/s 194547 calls/s 194547 msg/s
tcp rx: 11470 MB/s 188442 calls/s
tcp tx: 11803 MB/s 200193 calls/s 200193 msg/s
tcp rx: 11803 MB/s 194526 calls/s
tcp tx: 11832 MB/s 200681 calls/s 200681 msg/s
tcp rx: 11832 MB/s 194459 calls/s
tcp zerocopy
tcp rx: 7482 MB/s 80176 calls/s
tcp tx: 7482 MB/s 126908 calls/s 126908 msg/s
tcp rx: 6641 MB/s 112609 calls/s
tcp tx: 6641 MB/s 112649 calls/s 112649 msg/s
tcp tx: 6584 MB/s 111683 calls/s 111683 msg/s
tcp rx: 6584 MB/s 111617 calls/s
tcp zerocopy audit
tcp tx: 6719 MB/s 113968 calls/s 113968 msg/s
tcp rx: 6719 MB/s 113893 calls/s
tcp rx: 6772 MB/s 114831 calls/s
tcp tx: 6772 MB/s 114872 calls/s 114872 msg/s
tcp tx: 6793 MB/s 115226 calls/s 115226 msg/s
tcp rx: 7075 MB/s 116595 calls/s
Summary over 4.000 seconds...
sum tcp tx: 6921 MB/s 458580 calls (114645/s) 458580 msgs (114645/s)
./udpgso_bench_tx: Unexpected number of Zerocopy completions: 458580 expected 458578 received
udp
udp rx: 833 MB/s 607639 calls/s
udp tx: 851 MB/s 621264 calls/s 14448 msg/s
udp rx: 860 MB/s 627246 calls/s
udp tx: 860 MB/s 627284 calls/s 14588 msg/s
udp rx: 862 MB/s 628718 calls/s
udp tx: 861 MB/s 628574 calls/s 14618 msg/s
udp rx: 863 MB/s 630058 calls/s
udp gso
udp rx: 2310 MB/s 1683314 calls/s
udp tx: 2472 MB/s 41931 calls/s 41931 msg/s
udp rx: 2343 MB/s 1708032 calls/s
udp tx: 2493 MB/s 42298 calls/s 42298 msg/s
udp rx: 2322 MB/s 1692160 calls/s
udp tx: 2496 MB/s 42347 calls/s 42347 msg/s
udp gso zerocopy
udp rx: 1752 MB/s 1278423 calls/s
udp tx: 1778 MB/s 30162 calls/s 30162 msg/s
udp rx: 1804 MB/s 1316058 calls/s
udp tx: 1804 MB/s 30605 calls/s 30605 msg/s
udp rx: 1807 MB/s 1318120 calls/s
udp tx: 1808 MB/s 30681 calls/s 30681 msg/s
udp rx: 1730 MB/s 1261819 calls/s
udp gso timestamp
udp rx: 2296 MB/s 1673728 calls/s
udp tx: 2375 MB/s 40284 calls/s 40284 msg/s
udp rx: 2334 MB/s 1701632 calls/s
udp tx: 2377 MB/s 40319 calls/s 40319 msg/s
udp rx: 2335 MB/s 1702093 calls/s
udp tx: 2377 MB/s 40319 calls/s 40319 msg/s
udp rx: 2336 MB/s 1702656 calls/s
udp gso zerocopy audit
udp rx: 1717 MB/s 1252554 calls/s
udp tx: 1759 MB/s 29839 calls/s 29839 msg/s
udp rx: 1811 MB/s 1321003 calls/s
udp tx: 1811 MB/s 30722 calls/s 30722 msg/s
udp rx: 1811 MB/s 1320917 calls/s
udp tx: 1811 MB/s 30719 calls/s 30719 msg/s
udp rx: 1810 MB/s 1320606 calls/s
Summary over 4.000 seconds...
sum udp tx: 1839 MB/s 121868 calls (30467/s) 121868 msgs (30467/s)
Zerocopy acks: 121868 received 0 errors
udp gso timestamp audit
udp rx: 2231 MB/s 1626112 calls/s
udp tx: 2337 MB/s 39646 calls/s 39646 msg/s
udp rx: 2292 MB/s 1670400 calls/s
udp tx: 2365 MB/s 40122 calls/s 40122 msg/s
udp rx: 2287 MB/s 1666816 calls/s
udp tx: 2363 MB/s 40084 calls/s 40084 msg/s
udp rx: 2288 MB/s 1667840 calls/s
Summary over 4.000 seconds...
sum udp tx: 2412 MB/s 159818 calls (39954/s) 159818 msgs (39954/s)
Tx Timestamps: 159818 received 0 errors
udp gso zerocopy timestamp audit
udp rx: 1592 MB/s 1161479 calls/s
udp tx: 1624 MB/s 27560 calls/s 27560 msg/s
udp rx: 1657 MB/s 1208472 calls/s
udp tx: 1656 MB/s 28103 calls/s 28103 msg/s
udp rx: 1653 MB/s 1206064 calls/s
udp tx: 1653 MB/s 28047 calls/s 28047 msg/s
udp rx: 1648 MB/s 1202151 calls/s
Summary over 4.000 seconds...
sum udp tx: 1683 MB/s 111556 calls (27889/s) 111556 msgs (27889/s)
Tx Timestamps: 111556 received 0 errors
Zerocopy acks: 111556 received 0 errors
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