Advice on a multithreaded netisr patch?
fazaeli at sepehrs.com
Wed Apr 8 15:35:13 PDT 2009
Can you please comment on below statements ?!
Is the assertion true for all OSes (windows, linux, ...) or it
is just freebsd? I am actually concerned in how much production
ready is igb drivers in your opinion.
As a matter of fact, We have been (and are) using em drivers for years
production systems in biggest ICPs/ISPs/organizations without problem
have very good faith in it (I have not tested igb).
Barney Cordoba wrote:
--- On Tue, 4/7/09, Ivan Voras <ivoras at freebsd.org> wrote:
From: Ivan Voras <ivoras at freebsd.org>
Subject: Re: Advice on a multithreaded netisr patch?
To: freebsd-net at freebsd.org
Date: Tuesday, April 7, 2009, 5:59 PM
Barney Cordoba wrote:
1) Multiple TX queues are not supported. There's
some hokey code to
test, but it doesn't properly separate flows to
2) 2 Rx queues don't work, so only 1 and 4 work
3) With 4 queues, it just sucks up CPU under heavy
load on 4 cpus. It will
blow 4 cpus at a lower load than em will with 1
4) You'll need to fix DMA setup, as it sets the
to PAGE_SIZE. I haven't been able to convince Jack
that its wrong, not
that I've tried very hard since its easy to just
Reading this thread it looks like the development of both
is a bit stalled, doesn't it? AFAIK the em driver is
semi-officially abandoned, and both from my experience and
looks like new development and patches are being rejected.
Time to shop
To be fair, the OS doesn't really support multiqueue yet, or has
for only a few hours, so lets not go crazy.
It makes a lot more sense to have someone on the "team" work with
Jack on improving the performance and working out the kinks. When
I asked Jack about the poor performance of if_igb, he indicated that
Intel's position is that the drivers are "just samples", which really
doesn't give anyone much confidence that they want to run their business
on them. You already have Jack doing all of the hard work; that is
supporting the new-chip-per-week that intel puts out, so it seems to
me the best strategy would be to try to convince Intel that its in
their best interest to have drivers that work well so people don't
think that their hardware stinks.
As an example, the Chelsio 10gb bypass card is $3495. and an Intel
card is ~$1000, so its a big win for the community as a whole to have
good intel drivers going forward.
My work is commercially proprietary so I can't share my code, but
I can certainly share ideas on things that I've tested and discovered.
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Hooman Fazaeli <hf at sepehrs.com>
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