From: "Miquel van Smoorenburg" <miquels@cistron.nl>
To: linux-kernel@vger.kernel.org
Subject: Re: arch/i386/Kconfig: CONFIG_IRQBALANCE Description
Date: Tue, 23 Mar 2004 21:30:13 +0000 (UTC) [thread overview]
Message-ID: <c3qa94$qhi$1@news.cistron.nl> (raw)
In-Reply-To: 16480.28882.388997.71072@gargle.gargle.HOWL
In article <16480.28882.388997.71072@gargle.gargle.HOWL>,
John Stoffel <stoffel@lucent.com> wrote:
>
>And hey, under 2.6.5-rc2-mm1, it doens't seem to do anything:
>
> > zcat /proc/config.gz | grep IRQ
> CONFIG_IRQBALANCE=y
> CONFIG_IDEPCI_SHARE_IRQ=y
>
> > cat /proc/interrupts
> CPU0 CPU1
> 0: 46272316 487 IO-APIC-edge timer
> 1: 376 0 IO-APIC-edge i8042
> 16: 46770 3 IO-APIC-level ide2, ide3, ehci_hcd
> 17: 307832 1 IO-APIC-level eth0
> 18: 118258 1 IO-APIC-level aic7xxx, aic7xxx, ohci_hcd
> LOC: 46279245 46279281
Is that real SMP, or hyperthreading? If it's hyperthreading, then
it makes sense that the IRQs are not balanced.
In fact I have a server on which the IRQ balancing code does
balance over the 2 virtual CPUs by accident (still have to debug
what goes wrong and file a proper bug report) and as a result
performance sucked until I turned it off.
Mike.
--
Netu, v qba'g yvxr gur cynvagrkg :)
next prev parent reply other threads:[~2004-03-23 21:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-22 23:02 arch/i386/Kconfig: CONFIG_IRQBALANCE Description Rusty Russell
2004-03-23 17:16 ` John Stoffel
2004-03-23 21:30 ` Miquel van Smoorenburg [this message]
2004-03-24 14:04 ` John Stoffel
2004-03-25 19:07 ` Jamie Lokier
2004-03-26 10:39 ` Miquel van Smoorenburg
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