Re: [PATCH]cfq-iosched: give busy sync queue no dispatch limit

[Jens Axboe]

On 2011-03-04 09:01, Shaohua Li wrote:
> If there are a sync and an async queue and the sync queue's think time is small,
> we can ignore the sync queue's dispatch quantum. Because the sync queue will
> always preempt the async queue, we don't need to care about async's latency.
> This can fix a performance regression of aiostress test, which is introduced by
> commit f8ae6e3eb825. The issue should exist even without the commit, but the
> commit amplifies the impact.
> 
> The initial post does the same optimization for RT queue too, but since I have
> no real workload for it, Vivek suggests to drop it.

Thanks, applied.

-- 
Jens Axboe

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