From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: stefanha@gmail.com, qemu-devel@nongnu.org, nab@linux-iscsi.org,
kraxel@redhat.com
Subject: Re: [Qemu-devel] [PATCH 12/16] scsi-generic: use plain ioctl
Date: Fri, 19 Nov 2010 19:39:02 +0100 [thread overview]
Message-ID: <20101119183901.GI32461@lst.de> (raw)
In-Reply-To: <20101118144736.C183DF90AB@ochil.suse.de>
On Thu, Nov 18, 2010 at 03:47:36PM +0100, Hannes Reinecke wrote:
>
> aio_ioctl is emulated anyway and currently broken.
What's broken about it currently?
> So better use 'normal' ioctl here as there are no benefits
> on using the emulated async I/O call.
There are huge benefits. Without it the whole scsi command execution
happens synchronously in the qemu main loop, blocking guest execution.
next prev parent reply other threads:[~2010-11-19 18:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-18 14:47 [Qemu-devel] [PATCH 12/16] scsi-generic: use plain ioctl Hannes Reinecke
2010-11-19 18:39 ` Christoph Hellwig [this message]
2010-11-20 0:41 ` Nicholas A. Bellinger
2010-11-20 1:25 ` adq
2010-11-20 8:23 ` Nicholas A. Bellinger
2010-11-20 13:16 ` adq
2010-11-22 7:21 ` Hannes Reinecke
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