From: Ingo Molnar <mingo@elte.hu>
To: Ben Greear <greearb@candelatech.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, len.brown@intel.com
Subject: Re: PATCH: Allow over-ride of smp_found_cfg with kernel cmd-line option.
Date: Fri, 6 Feb 2009 20:31:21 +0100 [thread overview]
Message-ID: <20090206193121.GA32634@elte.hu> (raw)
In-Reply-To: <498B421D.9090609@candelatech.com>
* Ben Greear <greearb@candelatech.com> wrote:
> Allow user to keep smp_found_cfg set to 1 even if MADT
> cannot be parsed. This works around funky BIOS on FWA-7304
> (VIA CN700 chipset) system, and possibly other systems as well.
> Without this override, performance drops by around 15% on
> network throughput tests on this system.
The question is, _why_ does network performance drop?
Do you have a before/after pair of /proc/interrupts output
perhaps? Does the layout of IRQs change?
The system is not SMP - so only something about UP-IOAPIC can
be helpful to performance here - or some unknown effect.
Ingo
next prev parent reply other threads:[~2009-02-06 19:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-05 19:46 PATCH: Allow over-ride of smp_found_cfg with kernel cmd-line option Ben Greear
2009-02-05 19:52 ` Randy Dunlap
2009-02-05 19:58 ` Ingo Molnar
2009-02-05 20:45 ` Ben Greear
2009-02-06 19:21 ` PATCH: (v2) " Ben Greear
2009-02-06 19:30 ` Randy Dunlap
2009-02-06 19:34 ` Yinghai Lu
2009-02-06 20:27 ` PATCH: (v3) " Ben Greear
2009-02-07 2:57 ` Len Brown
2009-02-06 19:31 ` Ingo Molnar [this message]
2009-02-07 3:00 ` PATCH: " Len Brown
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