From: "dada1" <dada1@cosmosbay.com>
To: "Andi Kleen" <ak@suse.de>
Cc: "Andi Kleen" <ak@suse.de>, "Simon Kirby" <sim@netnation.com>,
<linux-kernel@vger.kernel.org>, <linux-net@vger.kernel.org>,
<davem@redhat.com>
Subject: Re: Longstanding networking / SMP issue? (duplextest)
Date: Thu, 20 Feb 2003 12:03:06 +0100 [thread overview]
Message-ID: <008601c2d8cf$a60e4c60$760010ac@edumazet> (raw)
In-Reply-To: 20030220105435.GD10374@wotan.suse.de
> > Yes IP is best-effort. But this argument cant explain why IP on linux
works
> > better if we disable SMP on linux...
>
> It has nothing to do with SMP. The lazy locking dropping packets can
happen
> on UP kernels too in extreme cases. Also with preempt.
>
Well, I too noticed that binding NIC IRQS one one CPU
echo 1 > /proc/irq/18/smp_affinity
helps a lot in normal cases.
Some of us want SMP machine because application needs a lot of CPU, but we
also need to not drop frames to save the limited network bandwith.
Thanks
next prev parent reply other threads:[~2003-02-20 10:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20030219174757.GA5373@netnation.com.suse.lists.linux.kernel>
2003-02-20 7:52 ` Longstanding networking / SMP issue? (duplextest) Andi Kleen
2003-02-20 7:38 ` David S. Miller
2003-02-20 9:20 ` Simon Kirby
2003-02-20 9:34 ` Andi Kleen
2003-02-20 10:12 ` dada1
2003-02-20 10:54 ` Andi Kleen
2003-02-20 11:03 ` dada1 [this message]
2003-02-21 4:24 ` David S. Miller
2003-02-21 7:27 ` Andi Kleen
2003-02-21 9:43 ` David S. Miller
2003-02-21 10:22 ` Andi Kleen
2003-02-21 10:11 ` David S. Miller
2003-02-21 10:45 ` Andi Kleen
2003-02-23 9:12 ` David S. Miller
2003-02-23 10:02 ` Christoph Hellwig
2003-02-23 9:55 ` David S. Miller
2003-02-23 10:30 ` Andi Kleen
2003-02-23 10:23 ` David S. Miller
2003-02-23 10:37 ` Christoph Hellwig
2003-02-23 9:58 ` David S. Miller
2003-02-21 15:15 ` Bill Davidsen
2003-02-19 17:47 Simon Kirby
2003-02-19 21:17 ` David S. Miller
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