From: Andi Kleen <andi@firstfloor.org>
To: Rick Jones <rick.jones2@hp.com>
Cc: Linux Network Development list <netdev@vger.kernel.org>
Subject: Re: smp_affinity, MSI-X and 2.6.21.1
Date: 09 May 2007 12:35:29 +0200 [thread overview]
Message-ID: <p733b26waha.fsf@bingen.suse.de> (raw)
In-Reply-To: <463F91D3.3010000@hp.com>
Rick Jones <rick.jones2@hp.com> writes:
> Folks -
>
> Is it a bug, or a feature that after changing a device's smp_affinity
> via echo "N" >> /proc/irq/M/smp_affinity that the new mask isn't
> visible via cat /proc/irq/M/smp_affinity until after actual interrupts
> are taken?
Intel chipsets can only safely update affinity during interrupt processing.
You see a side effect of the code implementing this restriction.
-Andi
next prev parent reply other threads:[~2007-05-09 9:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-07 20:53 smp_affinity, MSI-X and 2.6.21.1 Rick Jones
2007-05-07 23:07 ` Arjan van de Ven
2007-05-08 0:09 ` Rick Jones
2007-05-09 10:35 ` Andi Kleen [this message]
2007-05-09 9:46 ` David Miller
2007-05-09 11:50 ` Andi Kleen
2007-05-15 22:52 ` Rick Jones
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