Comment 30 for bug 620074
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0e1f616
(Get the code!)
(In reply to comment #16)
> I tried elevator=as on my system, and it did not change the behaviour.
> Copying
> files from external USB to internal encrypted SSD still totally smashes
> interactive performance. So this issue might be unrelated.
>
This may be an unrelated issue having to do with USB I/O - since USB seems to be more CPU intensive anyway.
When I experienced this bug (prior to switching from CFQ), it would happen whenever I copied a large file on ATA or SCSI devices and I noticed extremely high I/O wait times - with very low CPU usage. Not only during copying - but during any disk-intensive operation. Everything on my affected machines would come to a grinding halt until the operation was complete. Using AS for me so far has seemed to resolve the issue - as my machines are now responsive as they should be during heavy disk I/O.