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Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend o


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2] xen_disk: support "direct-io-safe" backend option
Date: Fri, 28 Jun 2013 18:26:15 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

Il 28/06/2013 18:17, Alex Bligh ha scritto:
> 
> But as Stefano says:
> 
> --On 28 June 2013 11:56:29 +0100 Stefano Stabellini
> <address@hidden> wrote:
> 
>> This is PV only, at least for the moment: emulated disks always use
>> writeback caching.
>> From the performance point of view, making this change for IDE disks is
>> not very important (because IDE is slow anyway).
> 
> ... perhaps 'who cares'.

There are plenty of emulated devices that are not that slow, though
perhaps Xen management does not support them: AHCI, MegaSAS, VMware
pvscsi, and of course virtio-{blk,scsi}...

Paolo



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