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SubjectRe: [PATCH 0/2] cfq-iosched: fixing RQ_NOIDLE handling.
Jeff Moyer <> writes:

> This, of course, raises the question of why the blk_yield patches didn't
> run into the same problem. Looking back at some saved traces, I don't
> see WBS (write barrier sync) requests, so I wonder if barriers weren't
> supported by my last storage system.

So, I tested Corrado's approach with -o nobarrier, and here are the

fs_mark: 363.291 files/sec
fio: 38.5 MB/s

I don't have time to analyze the data right now, and it's 600MB worth of
binary output. If you want, I can upload a representative sample
somewhere, let me know.

Anyway, I'll post an analysis tomorrow.


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