Messages in this thread | | | Date | Tue, 20 Jan 2009 23:38:19 -0500 | Subject | Re: [RFC PATCH] block: Fix bio merge induced high I/O latency | From | Ben Gamari <> |
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On Tue, Jan 20, 2009 at 7:25 PM, Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote: > * Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) wrote: > > As a side-note : I'd like to have my results confirmed by others.
Well, I think the (fixed) patch did help to some degree (I haven't done fio benchmarks to compare against yet). Unfortunately, the I/O wait time problem still remains. I have been waiting 3 minutes now for evolution to start with 88% I/O wait time yet no visible signs of progress. I've confirmed I'm using the CFQ scheduler, so that's not the problem.
Also, Jens, I'd just like to point out that the problem is reproducible across all schedulers. Does your patch seek to tackle a problem specific to the CFQ scheduler, leaving the I/O wait issue for later? Just wondering.
I'll post some benchmarks numbers once I have them. Thanks,
- Ben
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