[systemd-devel] [PATCH] [RFC][PLEASE TEST] readahead: chunk on spinning media

Kay Sievers kay at vrfy.org
Wed Mar 27 04:55:06 PDT 2013

On Sun, Mar 24, 2013 at 3:38 AM, Kok, Auke-jan H
<auke-jan.h.kok at intel.com> wrote:

>>> I don't see anything in udev code setting IOPRIO... perhaps elevating
>>> the few calls doing bklid and mount might be helpful?
>> Maybe that really makes a difference, we should definitely try that.
>> The blkid calls are really limited to a few bytes here and there, and
>> will never loop for a long time, so that should be fine.
>> Do you have a box, where you could you give it a quick try to bump the
>> prio for the libblkid calls:
>>   ioprio_set(IOPRIO_WHO_PROCESS, getpid(), ...)
>> in:
>>   src/udev/udev-builtin-blkid.c
>> ?
> I left my non-ssd dev box in the office, so it'll be monday - but I'll
> absolutely give it a good test run.

Could you still give that a simple try with current git and the
chunking in place, so that we have some idea if the blkid calls would
benefit from a higher priority?

Even if we decide against doing that in the end, it would be nice to know ...


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