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Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush req
From: |
Jamie Lokier |
Subject: |
Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request |
Date: |
Sat, 29 Mar 2008 02:11:26 +0000 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Paul Brook wrote:
> > That'll depend on what kind of device is emulated. Does the SCSI
> > emulation handle multiple in-flight commands with any guarantee on
> > order?
>
> SCSI definitely allows (and we emulate) multiple in flight commands.
> I can't find any requirement that writes must complete before a
> subsequent SYNCHRONISE_CACHE. However I don't claim to know the spec
> that well,
Aren't there SCSI tagged barrier commands or something like that,
which allow a host to request ordering between commands?
> it's probably not a bad idea have them complete anyway. Preferably
> this would be a completely asynchronous operation. i.e. the sync
> command returns immediately, but only completes when all preceding
> writes have completed and been flushed to disk.
I agree, that seems the optimal implementation.
-- Jamie
- [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/28
- Re: [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Jamie Lokier, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Paul Brook, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Paul Brook, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Jamie Lokier, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Paul Brook, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request,
Jamie Lokier <=
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Paul Brook, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Jamie Lokier, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Jamie Lokier, 2008/03/28
- Re: [kvm-devel] [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Marcelo Tosatti, 2008/03/29
Re: [Qemu-devel] [PATCH] QEMU: fsync AIO writes on flush request, Ian Jackson, 2008/03/28