From: Paolo Bonzini <pbonzini@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>,
ronnie sahlberg <ronniesahlberg@gmail.com>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] Weird iscsi/fd-event issue since recent merge of event system changes
Date: Mon, 21 May 2012 12:59:38 +0200 [thread overview]
Message-ID: <4FBA201A.5040505@redhat.com> (raw)
In-Reply-To: <4FBA1CC4.7020009@redhat.com>
Il 21/05/2012 12:45, Kevin Wolf ha scritto:
>> I have not yet found the exact part of this big patch that cause this
>> slowdown, but will continue investigating.
>>
>> I am posting this here in case someone has any idea or if 55ms rings any bells.
55ms is the frequency of the PIT while the BIOS is running. I'd guess
something is not waking up the iothread properly.
> The only thing in this merge that looks as if it could be related is
> Paolo's AIO changes between commit adfe92f6 and 9eb0bfca.
>
> Or if you use IDE, Stefan's patches to make PIO operations asynchronous
> could be related.
Yeah, both seem just as likely to be the culprit. Please bisect.
Paolo
next prev parent reply other threads:[~2012-05-21 10:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-21 6:07 [Qemu-devel] Weird iscsi/fd-event issue since recent merge of event system changes ronnie sahlberg
2012-05-21 10:45 ` Kevin Wolf
2012-05-21 10:59 ` Paolo Bonzini [this message]
2012-05-21 11:00 ` ronnie sahlberg
2012-05-21 13:20 ` Stefan Hajnoczi
2012-05-22 9:07 ` ronnie sahlberg
2012-05-22 9:15 ` Paolo Bonzini
2012-05-22 9:15 ` ronnie sahlberg
2012-05-22 9:29 ` Paolo Bonzini
2012-05-22 9:48 ` ronnie sahlberg
2012-05-22 10:03 ` ronnie sahlberg
2012-05-22 16:31 ` Michael Tokarev
2012-05-25 6:53 ` ronnie sahlberg
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