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Re: [Qemu-devel] Re: KVM call minutes for Sept 14
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] Re: KVM call minutes for Sept 14 |
Date: |
Wed, 15 Sep 2010 15:57:44 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100907 Fedora/3.0.7-1.fc12 Thunderbird/3.0.7 |
Am 15.09.2010 15:52, schrieb Anthony Liguori:
> On 09/15/2010 08:30 AM, Kevin Wolf wrote:
>> Am 15.09.2010 15:21, schrieb Anthony Liguori:
>>
>>> On 09/15/2010 07:38 AM, Kevin Wolf wrote:
>>>
>>>> No, we don't really care if the L2 entry is on disk. If the guest want
>>>> to have its data safe it needs to issue an explicit flush anyway. The
>>>> only thing we want to achieve with bdrv_write_sync is to maintain the
>>>> right order between metadata updates to survive a crash without corruption.
>>>>
>>>>
>>> Ah, yes, this is brand new :-)
>>>
>>> I was looking at my QED branch which is a few weeks old.
>>>
>> Well, the whole bdrv_pwrite_sync thing is new - with your benchmarking
>> you probably caught qcow2 at its worst performance in years.
>
> FWIW, we queued a run reverting the sync() stuff entirely as we were
> aware of that. Should have results this morning.
Okay. I think that will be helpful, even outside the context of QED. I'd
be interested how much of a difference it really makes in your tests.
Kevin
- [Qemu-devel] KVM call minutes for Sept 14, Chris Wright, 2010/09/14
- [Qemu-devel] Re: KVM call minutes for Sept 14, Anthony Liguori, 2010/09/14
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Kevin Wolf, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Anthony Liguori, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Kevin Wolf, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Anthony Liguori, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Kevin Wolf, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14, Anthony Liguori, 2010/09/15
- Re: [Qemu-devel] Re: KVM call minutes for Sept 14,
Kevin Wolf <=