Messages in this thread | | | Date | Tue, 20 Dec 2011 13:49:14 +0100 | From | Jens Axboe <> | Subject | Re: [RFT PATCH] blkio: alloc per cpu data from worker thread context( Re: kvm deadlock) |
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On 2011-12-19 19:27, Vivek Goyal wrote: > I think reverting the previous series is not going to be simple either. It > had 13 patches. > > https://lkml.org/lkml/2011/5/19/560 > > By making stats per cpu, I was able to reduce contention on request > queue lock. Now we shall have to bring the lock back.
That's not going to happen, having that lock in there was a disaster for small IO on fast devices. It's essentially the limiting factor on benchmark runs on the RHEL kernels that have it included and enabled...
-- Jens Axboe
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