From: Marek Kierdelewicz <marek@piasta.pl>
To: bridge@lists.linux-foundation.org
Subject: Re: [Bridge] Rx Buffer sizes on e1000
Date: Tue, 13 Nov 2007 10:12:03 +0100 [thread overview]
Message-ID: <20071113101203.1e0235c3@catlap> (raw)
In-Reply-To: <96CF49BD8B56384395D698BA99007FA32D4A@exchange.pacwire.local>
>Hi All,
Hi,
> I have a box with 24 e1000 cards in it. They are configured as 12
>bridges, each with 2 ports.
24 ports of e1000 nics means 24 interrupts used (or shared). Maybe
thats the source of the problem. Did you notice anything unusual in your
logs concerning e1000 nics?
>...
>CPU utilisation is hovering around 50%, and load average is
>consistently
>under 0.1, so I don't beleive I'm looking at a CPU bottleneck.
Is your box is multi-core (or HT-enabled)? Is your kernel SMP? If thats
the case then check per core CPU utilisation (press "1" when watching
top). You may be hitting roof only on one of the cores while avg.
utilisation is around 50%. If you're not familiar with "smp_affinity",
then you should read the following:
http://bcr2.uwaterloo.ca/~brecht/servers/apic/SMP-affinity.txt
cheers,
Marek Kierdelewicz
KoBa ISP
next prev parent reply other threads:[~2007-11-13 9:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-13 5:30 [Bridge] Rx Buffer sizes on e1000 Leigh Sharpe
2007-11-13 9:12 ` Marek Kierdelewicz [this message]
2007-11-13 18:04 ` Stephen Hemminger
-- strict thread matches above, loose matches on Subject: below --
2007-11-13 22:24 Leigh Sharpe
2007-11-13 22:46 ` Stephen Hemminger
2007-11-13 23:11 Leigh Sharpe
2007-11-13 23:20 Leigh Sharpe
2007-11-14 1:34 Leigh Sharpe
2007-11-14 5:26 Leigh Sharpe
2007-11-14 16:09 ` Andy Gospodarek
2007-11-14 21:47 Leigh Sharpe
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