From: Tim Kay <timk@advfn.com>
To: linux-kernel@vger.kernel.org
Subject: What am I losing with noapic
Date: Tue, 2 Apr 2002 10:53:08 +0000 [thread overview]
Message-ID: <200204021051.g32Ap6s12049@mail.advfn.com> (raw)
Hi all,
Does anyone know what I'm actually losing with having to set noapic on
bootup? I mean in real terms how much harder / slower is an SMP machine
working when it's doing standard multi-bus xt polling compared to when it's
in APIC poll state. I appreciate that there can be a reduction in interrupt
response latency using the damn thing but is this a measurable amount given a
machine processing about 1200 interrupts/sec? (this figure is a sum rather
than per processor). As an added complication how do I get around interrupt
routing conflicts in noapic mode and do the 'routing conflict for xx:xx:xx
have X want Y' messages make any difference to this performance?
A useful URL (I couldn't find any) or reference would suffice if this is too
invloved or boring a topic to explain easily.
TIA
Tim
--
----------------
Tim Kay
systems administrator
Advfn.com Plc - http://www.advfn.com/
next reply other threads:[~2002-04-02 10:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-02 10:53 Tim Kay [this message]
2002-04-02 11:24 ` Tigran Aivazian
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