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From: Peter Lieven <pl@kamp.de>
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Subject: Re: [Qemu-devel] [PATCH 2/4] block: immediately cancel oversized
	read/write requests
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: =?windows-1252?Q?Beno=EEt_Canet?= <benoit.canet@irqsave.net>, Kevin Wolf <kwolf@redhat.com>, ronnie sahlberg <ronniesahlberg@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>


Am 18.09.2014 um 16:17 schrieb Paolo Bonzini <pbonzini@redhat.com>:

> Il 18/09/2014 16:16, Peter Lieven ha scritto:
>>> 
>>>> As you can see from the multiwrite_merge trace the merging has never
>>>> been stopped because of
>>>> the max_transfer_length. The question is, why are the I/O requests
>>>> not coming in as specified?
>>> I think that's because of the filesystem.  Try writing directly to a
>>> device.
>> 
>> thats what I did...
> 
> Ah, I saw of=test.

It was definitely /dev/vda. Any ideas? Maybe something in the virtio drivers?

Peter