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Message-ID: <1337589620.3361.23.camel@edumazet-glaptop>
Date: Mon, 21 May 2012 10:40:20 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Denys Fedoryshchenko <denys@...p.net.lb>
Cc: Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org,
e1000-devel@...ts.sourceforge.net, jeffrey.t.kirsher@...el.com,
jesse.brandeburg@...el.com, davem@...emloft.net
Subject: Re: Strange latency spikes/TX network stalls on Sun Fire
X4150(x86) and e1000e
On Mon, 2012-05-21 at 10:30 +0200, Eric Dumazet wrote:
> On Mon, 2012-05-21 at 11:06 +0300, Denys Fedoryshchenko wrote:
>
> > Not sure it is a lot of time, after all it is 2 x core quad machine,
> > should be enough fast for pings.
> > It will cause stalls on small packets even more seems.
> >
> > Tested latest git, net-next, still the same, stalls.
> > hardware latency detector are silent by the way, so there is no
> > significant SMI.
> >
>
> I am trying to reproduce your problem here with no luck yet.
>
> I wonder of softirq are correctly scheduled on your machine
>
By the way, fact you have 8 cpus is irrelevant.
Only one cpu has queued the NET_TX_SOFTIRQ softirq (serviced by
net_tx_action())
If this cpu is busy servicing other stuff, no other cpu will help.
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