Hello,
I've been using UML for production servers for years, but I'm now
experiencing some performance problems with UBD (I've always used it
with CONFIG_BLK_DEV_UBD_SYNC).
I tried to patch UBD to run several I/O threads that perform the
requests in parallel. It improved performances significantl
ice" patch look clean and solves the
problem.
Performing parallel I/O also much improves the performance (at least
with ubd=sync), but my patch is certainly not clean enough for
inclusion. Jeff, you told me you had such a patch; would you like me tou
give it a try?
Chee
Hi,
Nicolas Boullis wrote:
> On a reasonably new host, using as UBD devices logical volumes built
> on top of a FC SAN, building a 10GB ext3 filesystem took something
> like 50 seconds before my patch, and something like 3 seconds after
> it. (I can check the exact values
ally secured on the discs.
Hope this helps,
Nicolas Boullis
Ecole Centrale Paris
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Hi,
I wrote:
>
> For what it's worth, here is my quick-n-dirty proof-of-concept patch
> that enables parallel I/O. Note that it is based on 2.6.24.
>
> If people are interested, I can try to make a clean patch out of it.
For what it's worth, I fixed a few bugs in my patch. Here is the new
patch
ainers all busy with real life?
Cheers,
Nicolas Boullis
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G
Hi,
For what it's worth, here is my quick-n-dirty proof-of-concept patch
that enables parallel I/O. Note that it is based on 2.6.24.
If people are interested, I can try to make a clean patch out of it.
Cheers,
Nicolas
--- linux-source-2.6.24/arch/um/drivers/ubd_kern.c.orig 2008-09-15 10:55:51.
rently, my
code is more a dirty proof-of-concept than a clean patch.
Would you be interested by my work?
Cheers,
Nicolas Boullis
École Centrale Paris
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