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From: Pavel Machek on 3 Aug 2010 03:00
On Wed 2010-06-02 22:18:59, Nigel Cunningham wrote:
> Hi all.
>
> Here is my current patch queue.
>
> Taken together, the patches implement the separation of low level
> block i/o into a separate file, switch from using swap_map_pages
> to extents stores prior to the 'header' page and implement fully
> asynchronous (rather than batched I/O). I have only run it under
> VMware so far, but would estimate a doubling in speed due to the
> async i/o.

Do you have any numbers from real hw? Could similar speedup be
accomplished by just increasing the batch size?
Pavel
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From: Nigel Cunningham on 3 Aug 2010 03:10
Hi.

On 03/08/10 16:55, Pavel Machek wrote:
> On Wed 2010-06-02 22:18:59, Nigel Cunningham wrote:
>> Hi all.
>>
>> Here is my current patch queue.
>>
>> Taken together, the patches implement the separation of low level
>> block i/o into a separate file, switch from using swap_map_pages
>> to extents stores prior to the 'header' page and implement fully
>> asynchronous (rather than batched I/O). I have only run it under
>> VMware so far, but would estimate a doubling in speed due to the
>> async i/o.
>
> Do you have any numbers from real hw? Could similar speedup be
> accomplished by just increasing the batch size?

Yeah. I've been thinking I should really prepend a patch that lets you
get the stats post-resume - unless you guys have some trick to enable
you to read them that I haven't noticed yet :)

Nigel
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