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Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics |
Date: |
Wed, 09 Jan 2013 12:10:31 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 09.01.2013 11:36, schrieb Liu Yuan:
> On 01/09/2013 06:25 PM, Paolo Bonzini wrote:
>> But why is it useful to force-disable writeback caching? Do you have
>> any performance numbers?
>
> This is not related to performance. What I want is to allow users to
> choose Sheepdog cache mode (writethrough/writeback/directio) from cache=xxx.
The question was which effects these modes have, and especially what the
user-visible differences between writeback+flush and writethrough cache are.
> Obviously writeback mode show much better write performance over
> writethrough cache in Sheepdog. NOTE: writethrough cache in Sheepdog is
> a readonly cache which is always consistent with cluster data thus need
> no flush at all. This is to boost read performance for read intensive
> Guest over Sheepdog iamges.
This is the definition of a writethrough cache.
Kevin
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, (continued)
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Kevin Wolf, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Liu Yuan, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Jamie Lokier, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Jamie Lokier, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics,
Kevin Wolf <=
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Paolo Bonzini, 2013/01/09
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Jamie Lokier, 2013/01/10
- Re: [Qemu-devel] [PATCH] sheepdog: implement direct write semantics, Kevin Wolf, 2013/01/10