Vladislav Bolkhovitin wrote:
Cameron Harr wrote:
Vlad,
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. I'm
currently doing 512B writes, and this gives me about a 4:1 ratio of
context switches to IOPs with 1 SCST thread (70K IOPs) and around
4.5:1 when there are 8 SCST threads (75K IOPs).
This is still too high. Considering that each CS is about 1
microsecond you can estimate how many IOPS's it costs you.
Dropping scst_threads down to 2, from 8, with 2 initiators, seems to
make a fairly significant difference, propelling me to a little over
100K IOPs and putting the CS rate around 2:1, sometimes lower. 2 threads
gave the best performance compared to 1, 4 and 8.
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