Comment 82 for bug 595047
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#82 |
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bbfa235
(Get the code!)
I hit this bug on Ubuntu 8.10 (updated to 2.6.27-9-generic) running Vmware Workstation 6.5.126130 with Ubuntu 8.04.1 LTS as a guest. It was esp pronounced when resuming a suspended VM.
I tried the different elevator io schedulers. Nothing helped.
Independent of VMWare, if I ran bonnie in one shell and launched firefox the whole system behaved in a very chunky manner.
Renicing pdflush -10 had some great improvement on basic responsiveness. The weird part was after re-recreating a new VM and not seeing the iowait problems I then tried resuming a VM with VMware at the same time I was compressing a tar file with pbzip2 (parallel bzip). All 4 cores were pegged and my load average was normal, system responsiveness was good. As **soon** as I tried resuming the VM with VMWare workstation, the cpu load dropped to 1-5% across all cpus. iowait times shot way up. I have now killed Vmware and iowait times have dropped but my maximum read speed is hovers around 1MB/s (as measured with iostat). This is another symptom of the iowait problem.
iostat -c -d -m -x sda 1
rMB/s is usually never over 2MB/s