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Re: [Qemu-devel] Weird iscsi/fd-event issue since recent merge of event

From: Paolo Bonzini
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
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 
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
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