From: Jack Steiner <steiner@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: RE: Re: Re: [Linux-ia64] Re: Lockups on 2.4.1
Date: Wed, 28 Feb 2001 17:05:07 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590693005223@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590693005190@msgid-missing>
> Thanks for investigating the problem and the patch. The problem is happening
> because the timeout (40000UL) is not long enough. The processor is taking
> long time than this to complete the handle_IPI and processor doing the
> flush_tlb_no_ptcg is timing out and sending the IPI again. So, we should
> increase the timeout rather than decreasing the timeout to avoid extra
> reschedule IPIs.
I wondered about the timeout too. I agree that we do not want to go thru
the resend_IPI code very often. I planned to add some stats to see
how often the resend occurred & also whether any IPIs were really being
dropped.
Is the code to resend IPIs going to remain OR is it just to workaround
an earlier sighting (#117) that reported IPIs being dropped?? If the resend
is permanent, then the "reschedule IPI" hack needs to be changed to something
more like a null IPI. If the resend is temporary, then just increasing
the timeout seems fine.
--
Thanks
Jack Steiner (651-683-5302) (vnet 233-5302) steiner@sgi.com
next prev parent reply other threads:[~2001-02-28 17:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-22 20:48 Re: Re: [Linux-ia64] Re: Lockups on 2.4.1 Jack Steiner
2001-02-28 0:39 ` Mallick, Asit K
2001-02-28 6:09 ` David Mosberger
2001-02-28 17:05 ` Jack Steiner [this message]
2001-02-28 17:56 ` Mallick, Asit K
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