From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
qemu-devel <qemu-devel@nongnu.org>,
ronnie sahlberg <ronniesahlberg@gmail.com>
Subject: Re: [Qemu-devel] virtio-scsi vs. virtio-blk
Date: Thu, 09 Aug 2012 16:35:27 +0200 [thread overview]
Message-ID: <5023CAAF.3040000@redhat.com> (raw)
In-Reply-To: <5023C083.2030709@profihost.ag>
Il 09/08/2012 15:52, Stefan Priebe - Profihost AG ha scritto:
>
> Am 09.08.2012 15:42, schrieb Paolo Bonzini:
>> 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.
>
> Thanks will do so. Right now i'm getting virtio_net virtio2: output:id 1
> is not a head!
>
> and then network is down.
Please disable vhost, or ensure that you have the patch that Stefan
pointed you to.
Paolo
next prev parent reply other threads:[~2012-08-09 14:35 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-08 15:21 [Qemu-devel] virtio-scsi vs. virtio-blk Stefan Priebe
2012-08-08 16:17 ` Paolo Bonzini
2012-08-08 17:12 ` Stefan Priebe
2012-08-08 17:37 ` Paolo Bonzini
2012-08-09 6:13 ` Stefan Priebe
2012-08-09 7:01 ` Paolo Bonzini
2012-08-09 7:07 ` Stefan Priebe
2012-08-09 7:19 ` Paolo Bonzini
2012-08-09 7:41 ` Stefan Priebe
2012-08-09 7:53 ` Paolo Bonzini
2012-08-09 8:00 ` Stefan Priebe
2012-08-09 8:03 ` Paolo Bonzini
2012-08-09 9:18 ` Stefan Hajnoczi
2012-08-09 10:17 ` Stefan Priebe - Profihost AG
2012-08-09 11:04 ` Stefan Hajnoczi
2012-08-09 11:10 ` Paolo Bonzini
2012-08-09 11:24 ` Stefan Priebe - Profihost AG
2012-08-09 12:08 ` Stefan Priebe - Profihost AG
2012-08-09 12:19 ` Paolo Bonzini
2012-08-09 12:31 ` Stefan Priebe - Profihost AG
2012-08-09 12:44 ` Paolo Bonzini
2012-08-09 15:41 ` Stefan Priebe - Profihost AG
2012-08-09 12:52 ` ronnie sahlberg
2012-08-09 13:15 ` Paolo Bonzini
2012-08-09 13:39 ` Stefan Priebe - Profihost AG
2012-08-09 13:42 ` Paolo Bonzini
2012-08-09 13:52 ` Stefan Priebe - Profihost AG
2012-08-09 14:35 ` Paolo Bonzini [this message]
2012-08-09 14:25 ` Stefan Priebe - Profihost AG
2012-08-10 9:22 ` Stefan Priebe - Profihost AG
2012-08-10 10:20 ` Paolo Bonzini
2012-08-10 10:28 ` Stefan Priebe - Profihost AG
2012-08-10 10:30 ` Paolo Bonzini
2012-08-10 11:12 ` ronnie sahlberg
2012-08-10 11:57 ` Stefan Priebe - Profihost AG
2012-08-10 12:04 ` ronnie sahlberg
2012-08-10 12:14 ` Stefan Priebe - Profihost AG
2012-08-10 12:24 ` ronnie sahlberg
2012-08-10 12:35 ` Stefan Priebe - Profihost AG
2012-08-10 12:39 ` Paolo Bonzini
2012-08-10 12:43 ` Stefan Priebe - Profihost AG
2012-08-10 11:20 ` ronnie sahlberg
2012-08-10 11:54 ` Stefan Priebe - Profihost AG
2012-08-10 11:58 ` ronnie sahlberg
2012-08-10 12:38 ` Stefan Priebe - Profihost AG
2012-08-10 11:49 ` Stefan Priebe - Profihost AG
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