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Jeff Rizzo wrote:
> Jason Thorpe wrote:
>  =20
>> On Feb 11, 2006, at 10:38 AM, Rui Paulo wrote:
>>
>>    =20
>>> Jason Thorpe <thorpej@shagadelic.org> writes:
>>>
>>>      =20
>>>> Has anyone measured the performance impact of this at Gig-E speeds?
>>>>        =20
>>> No, I have to buy a Gig-E switch first.
>>>      =20
>> This needs to be done.  rnd_add_uint32() seems to do an awful lot of
>> work.
>>
>> -- thorpej
>>    =20
>
> I will undertake to do this testing as soon as I get my own pending
> sk(4) changes in-tree.  (consider this a plug for people who care about=

>  =20

Unfortunately, I've been having some hardware troubles with the box I
was doing this testing on, so I haven't been able to be as thorough as
I'd like.  Also, netperf seems to be having some sort of systematic
trouble that I don't have the energy to debug right now;  at least some
of these runs are suspect.

I did two passes, with a -current kernel over a 2.1-ish userland; one
with "rndctl -e -c -d skc0", and one without.  From these (flawed)
results, it looks like with the rnd stuff enabled, most tests are 2-3%
slower.  (unfortunately, this is a 32-bit card on a 32-bit PCI bus, so
it's not going to stress things as hard as it might if I could saturate
the gigE)  As you'll note, one of the UDP request/response runs shows a
very large decrease in performance, but netperf also complains about not
being able to establish desired confidence in the results.

If anyone has suggestions about specific better tests or benchmarks to
do, I'd be happy to hear about them.  I may or may not eventually find
time to run them, too.  :)

(These tests are the "snapshot_script" from netperf, in pkgsrc, run
against a wm(4) card in a NetBSD/macppc box, through an SMC gigE switch)

+j




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