Re: [ofa-general] SRP/mlx4 interrupts throttling performance

[Cameron Harr]

Bart Van Assche wrote: On Mon, Oct 6, 2008 at 5:31 PM, Cameron Harr <[EMAIL PROTECTED]> wrote: Thanks for the suggestion. As I look via vmstat, my CSw/s rate is fairly constant around 280K when scst_threads=1 (per Vu's suggestion) and pops up to ~330-340K CSw/s when scst_threads is set to 8. Which threads are causing all those context switches ? You can find this out by making sure that CONFIG_SCHEDSTATS=y is enabled in the kernel .config and by running the following bash command: ( cd /proc && for p in [1-9]* ; do echo "$(<${p}/cmdline) $(<${p}/schedstat)" ; done ) | sort -rn -k 3 | head Thanks for the bash lesson :). It wasn't working how I think you had planned because many processes have nothing in the cmdline file. So, I touched up the command a bit, putting in the pid and displaying the cmdline at the end so as not to mess up the sort: ( cd /proc && for p in [1-9]* ; do echo -e "$p:\t $(<${p}/schedstat) \t\t$(<${p}/cmdline)" ; done ) | sort -rn -k 3 | head Using that, and watching who's moving up in amount of time waiting, the main culprits are all of the scst_threads when scst_threads=8, and when threads=2, the culprit is srpt_thread. -Cameron

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