Re: [Xen-devel] 4.2.1: Poor write performance for DomU.

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On 08/03/13 10:46, Steven Haigh wrote:
> On 8/03/2013 8:43 PM, Roger Pau Monné wrote:
>> On 08/03/13 09:54, Steven Haigh wrote:
>>> Just wondering if there is any further news or tests that I might be
>>> able to do on this?
>>
>> I have been working on speed improvements for blkfront/blkback, and
>> submitted the first RFC series of patches last week, which can be found
>> at http://thread.gmane.org/gmane.linux.kernel/1448584. This is still a
>> WIP, so if you want to test them please be aware there might be hidden
>> bugs. I've also pushed them to a branch in my git repo:
>>
>> git://xenbits.xen.org/people/royger/linux.git xen-block-indirect
>>
>> You will need to recompile both the Dom0/DomU kernels (if they are not
>> the same) if you want to test them.
>>
> 
> Hmm - how will this react with using say, a stock kernel in the DomU (ie
> EL6.3 kernel) but these changes in the Dom0?

It should work, but you won't be able to see much performance
improvements (if any at all). Anyway, I've just referred to this series
for testing, but this should not be used on anything that's supposed to
be stable/production.


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