[Bug 131094] Re: Heavy Disk I/O harms desktop responsiveness

Peter Hoeg peter at hoeg.com
Thu Oct 21 16:02:51 UTC 2010


I haven't, no, but what effect would swappiness have if there is no swap
anyway?

/Peter


On Thu, Oct 21, 2010 at 23:54, daneel <131094 at bugs.launchpad.net> wrote:
> Have try swappiness = 0 ?
>
> 2010/10/21 Peter Hoeg <peter at hoeg.com>:
>> I'll try that on the box tomorrow.
>>
>> The other odd thing is that turning off swap is extremely slow. As an
>> example if I have about 60% memory used then it will start swapping a
>> few 100 MBs. If I then do a "swapoff -a", then the box obviously starts
>> swapping in, but it happens at approximately 500KB/s.
>>
>> --
>> Heavy Disk I/O harms desktop responsiveness
>> https://bugs.launchpad.net/bugs/131094
>> You received this bug notification because you are a direct subscriber
>> of the bug.
>>
>> Status in The Linux Kernel: Invalid
>> Status in “linux” package in Ubuntu: Confirmed
>> Status in “linux-source-2.6.22” package in Ubuntu: Won't Fix
>>
>> Bug description:
>> Binary package hint: linux-source-2.6.22
>>
>> When compared with 2.6.15 in feisty, heavy disk I/O causes increased iowait times and affects desktop responsiveness in 2.6.22
>>
>> this appears to be a regression from 2.6.15 where iowait is much lower and desktop responsiveness is unaffected with the same I/O load
>>
>> Easy to reproduce with tracker - index the same set of files with 2.6.15 kernel and 2.6.22 kernel and the difference in desktop responsiveness is massive
>>
>> I have not confirmed if a non-tracker process which does heavy disk i/o (especially writing) replicates this yet - will do further investigation soon
>>
>> To unsubscribe from this bug, go to:
>> https://bugs.launchpad.net/linux/+bug/131094/+subscribe
>>
>
> --
> Heavy Disk I/O harms desktop responsiveness
> https://bugs.launchpad.net/bugs/131094
> You received this bug notification because you are a direct subscriber
> of the bug.
>

-- 
Heavy Disk I/O harms desktop responsiveness
https://bugs.launchpad.net/bugs/131094
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