[rfc] small bioq patch

[Maksim Yevmenkin]

On Fri, Oct 11, 2013 at 12:25 PM, Eric van Gyzen <eric at vangyzen.net> wrote:
> Maksim,
>
> The graphs were not attached.  Perhaps the list stripped them.  Could you
> post them on the web instead?

err... sorry about it.. please try

http://people.freebsd.org/~emax/c034.png
http://people.freebsd.org/~emax/c044.png

thanks
max

>> hello,
>>
>> i would like to submit the attached bioq patch for review and
>> comments. this is proof of concept. it helps with smoothing disk read
>> service times and arrear to eliminates outliers. please see attached
>> pictures (about a week worth of data)
>>
>> - c034 "control" unmodified system
>> - c044 patched system
>>
>> graphs show max/avg disk read service times for both systems across 36
>> spinning drives. both systems are relatively busy serving production
>> traffic (about 10 Gbps at peak). grey shaded areas on the graphs
>> represent time when systems are refreshing their content, i.e. disks
>> are both reading and writing at the same time.
>>
>> thanks,
>> max