Date: Fri, 10 Nov 2006 15:04:51 -0500 From: Mike Tancsa <mike@sentex.net> To: Scott Long <scottl@samsco.org> Cc: freebsd-net <freebsd-net@freebsd.org>, glebius@freebsd.org, freebsd-stable@freebsd.org, Jack Vogel <jfvogel@gmail.com> Subject: Re: Proposed 6.2 em RELEASE patch Message-ID: <200611102004.kAAK4iO9027778@lava.sentex.ca> In-Reply-To: <200611092200.kA9M0q1E020473@lava.sentex.ca> References: <2a41acea0611081719h31be096eu614d2f2325aff511@mail.gmail.com> <200611091536.kA9FaltD018819@lava.sentex.ca> <45534E76.6020906@samsco.org> <200611092200.kA9M0q1E020473@lava.sentex.ca>
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At 05:00 PM 11/9/2006, Mike Tancsa wrote:
>At 10:51 AM 11/9/2006, Scott Long wrote:
>>Mike Tancsa wrote:
>>>At 08:19 PM 11/8/2006, Jack Vogel wrote:
>>>
>>>>BUT, I've added the FAST_INTR changes back into the code, so
>>>>if you go into your Makefile and add -DEM_FAST_INTR you will
>>>>then get the taskqueue stuff.
>>>It certainly does make a difference performance wise. I did some
>>>quick testing with netperf and netrate. Back to back boxes, using
>>>an AMD x2 with bge nic and one intel box
>>>CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ (2009.27-MHz
>>>686-class CPU)
>>>CPU: Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz (2144.01-MHz
>>>686-class CPU)
>>>The intel is a DG965SS with integrated em nic, the AMD a Tyan
>>>with integrated bge. Both running SMP kernels with pf built in, no inet6.
>>>
>>>Intel box as sender. In this test its with the patch from
>>>yesterday. The first set with the patch as is, the second test
>>>with -DEM_FAST_INTR.
>>
>>Thanks for the tests. One thing to note is that Gleb reported a higher
>>rate of dropped packets with INTR_FAST. He is the only one who has
>>reported this, so I'd like to find out if there is something unique to
>>his environment, or if there is a larger problem to be addressed. There
>>are ways that we can change the driver to not drop any packets at all
>>for Gleb, but they expose the system to risk if there is ever an
>>accidental (or malicious) RX flood on the interface.
>
>With a high rate of packets, I am able to live lock the box. I
>setup the following
Some more tests. I tried again with what was committed to today's
RELENG_6. I am guessing its pretty well the same patch. Polling is
the only way to avoid livelock at a high pps rate. Does anyone know
of any simple tools to measure end to end packet loss ? Polling will
end up dropping some packets and I want to be able to compare. Same
hardware from the previous post.
SMP kernel fastfwd pf ipfw FAST_INTR streams np
(Mb)
x x x 2 livelock
x x x x 2 468 livelock
x x 2 453 lost
packets, box sluggish
x x x 2 lost
packets, box sluggish
x 2 468 lost
packets, box
sluggish
x x 2 468 livelock
x x x 2 468 livelock
2 475 livelock
x 2 livelock
P 2 OK
P x 2 OK
P x 2 OK
The P is for Uniproc, but with Polling enabled (also kern.polling.idle_poll=1)
UP single stream 58Kpps, no polling in kernel
[bsd6-32bit]# ./netblast 192.168.44.1 500 10 10
start: 1163184051.627479975
finish: 1163184061.628200458
send calls: 5869051
send errors: 0
approx send rate: 586905
approx error rate: 0
with polling
[bsd6-32bit]# ./netblast 192.168.44.1 500 10 10
start: 1163184606.651001121
finish: 1163184616.651288588
send calls: 5866199
send errors: 1
approx send rate: 586619
approx error rate: 0
With polling and 2 streams at the same time (a lot of pps! and its
still totally responsive!!)
[r6-32bit]# ./netblast 192.168.88.218 500 10 10
start: 1163184712.103954688
finish: 1163184722.104388542
send calls: 4528941
send errors: 0
approx send rate: 452894
approx error rate: 0
[r6-32bit]#
[bsd6-32bit]# ./netblast 192.168.44.1 500 10 20
start: 1163184793.172036336
finish: 1163184813.173028921
send calls: 11550594
send errors: 0
approx send rate: 577529
approx error rate: 0
[bsd6-32bit]#
polling, 2 streams at the same time
[bsd6-32bit]# ./netblast 192.168.44.1 500 10 20
start: 1163185058.477137404
finish: 1163185078.478025226
send calls: 11679831
send errors: 0
approx send rate: 583991
approx error rate: 0
[bsd6-32bit]# ./netblast 192.168.44.1 500 10 20
start: 1163185167.969551943
finish: 1163185187.970435295
send calls: 11706825
send errors: 0
approx send rate: 585341
approx error rate: 0
[bsd6-32bit]#
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