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Re: [Qemu-devel] virtio-scsi vs. virtio-blk


From: Paolo Bonzini
Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk
Date: Thu, 09 Aug 2012 15:42:15 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

Il 09/08/2012 15:39, Stefan Priebe - Profihost AG ha scritto:
>> scsi-generic would indeed incur some overhead because it does not do
>> scatter/gather I/O directly, but scsi-hd/scsi-block do not have this
>> overhead.  In any case, that should be visible through the output of
>> perf if it is significant.
> 
> Thanks for your help and replies. I'm a little bit lost on all these
> comments. So what to check / do next?

Try with the deadline scheduler, and run "perf top" in guest/host if the
problems persist.

Paolo



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