Comment 354 for bug 131094

Have try swappiness = 0 ?

2010/10/21 Peter Hoeg <email address hidden>:
> 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
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>
> 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
>
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