Messages in this thread | | | Date | Fri, 1 Apr 2016 16:04:12 +1100 | From | Dave Chinner <> | Subject | Re: [PATCHSET v3][RFC] Make background writeback not suck |
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On Thu, Mar 31, 2016 at 09:29:30PM -0600, Jens Axboe wrote: > On 03/31/2016 06:56 PM, Dave Chinner wrote: > >I'm not changing the host kernels - it's a production machine and so > >it runs long uptime testing of stable kernels. (e.g. catch slow > >memory leaks, etc). So if you've disabled throttling in the guest, I > >can't test the throttling changes. > > Right, that'd definitely hide the problem for you. I'll see if I can > get it in a reproducible state and take it from there. > > On your host, you said it's SCSI backed, but what does the device look like?
HW RAID 0 w/ 1GB FBWC (dell h710, IIRC) of 2x200GB SATA SSDs (actually 256GB, but 25% of each is left as spare, unused space). Sustains about 35,000 random 4k write IOPS, up to 70k read IOPS.
Cheers,
Dave. -- Dave Chinner david@fromorbit.com
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