From: Jeff Garzik <jgarzik@pobox.com>
To: Nivedita Singhvi <niv@us.ibm.com>
Cc: Arjan van de Ven <arjanv@redhat.com>,
"Martin J. Bligh" <mbligh@aracnet.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
Andrew Morton <akpm@osdl.org>, Anton Blanchard <anton@samba.org>,
linux-kernel@vger.kernel.org
Subject: Re: CONFIG_IRQBALANCE for AMD64?
Date: Fri, 28 May 2004 15:58:35 -0400 [thread overview]
Message-ID: <40B799EB.8060000@pobox.com> (raw)
In-Reply-To: <40B7984E.7040208@us.ibm.com>
Nivedita Singhvi wrote:
> I see networking interrupts requiring fine granularity
> balancing, to avoid the potential for dropped packets and
> long latencies. That is, given a busy server that is
> seeing a lot of interrupts, fair distribution of the
> interrupts is required within a very small amount of time,
> and we cannot require a user space daemon that parses the /proc
> file system and applies a policy and then rebinds irqs
> to different CPUs to run with that frequency.
Network is one of the areas where you _don't_ want to be constantly
pointing your NIC's irq to different CPUs.
Cache affinity, packet re-ordering problems, and other fun ensue.
Jeff
next prev parent reply other threads:[~2004-05-28 20:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-28 17:09 CONFIG_IRQBALANCE for AMD64? Nakajima, Jun
2004-05-28 17:40 ` Jeff Garzik
2004-05-28 17:45 ` Arjan van de Ven
2004-05-28 17:46 ` Martin J. Bligh
2004-05-28 17:57 ` Arjan van de Ven
2004-05-28 19:51 ` Nivedita Singhvi
2004-05-28 19:58 ` Jeff Garzik [this message]
2004-05-28 20:14 ` Nivedita Singhvi
2004-05-28 21:45 ` Jeff Garzik
2004-05-28 20:03 ` Arjan van de Ven
-- strict thread matches above, loose matches on Subject: below --
2004-05-28 23:37 Nakajima, Jun
2004-05-28 22:05 Nakajima, Jun
2004-05-28 22:54 ` Andi Kleen
2004-05-29 1:27 ` Nick Piggin
2004-05-29 10:06 ` Andi Kleen
2004-05-29 10:10 ` Nick Piggin
2004-05-29 11:18 ` Andi Kleen
[not found] <20Uhn-7bP-11@gated-at.bofh.it>
[not found] ` <20UqZ-7i7-5@gated-at.bofh.it>
2004-05-28 21:45 ` Andi Kleen
2004-05-28 18:20 Nakajima, Jun
2004-05-28 18:33 ` Martin J. Bligh
2004-05-28 18:44 ` Arjan van de Ven
2004-05-28 18:57 ` Martin J. Bligh
2004-05-28 19:01 ` Arjan van de Ven
2004-05-29 8:38 ` michael
2004-05-29 8:41 ` michael
2004-05-29 8:45 ` Arjan van de Ven
2004-05-27 3:48 Thomas Zehetbauer
2004-05-27 5:13 ` Jeff Garzik
2004-05-27 16:36 ` Thomas Zehetbauer
2004-05-27 16:50 ` Arjan van de Ven
2004-05-27 21:37 ` Chris Wedgwood
2004-05-27 17:03 ` Anton Blanchard
2004-05-27 22:36 ` Thomas Zehetbauer
2004-05-28 5:57 ` Arjan van de Ven
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