On 09/12/19 11:26, Daniel Janzon wrote:
Exactly. The md driver executes on a single core, but with a bunch of RAID5s
I can distribute the load over many cores. That's also why I cannot join the
bunch of RAID5's with a RAID0 (as someone suggested) because then again
all data is pulled through a single core.
MD RAID0 is extremely fast, using a single core at the striping level
should pose no problem. Did you actually tried this setup?
Anyway, the suggestion from Guoqing Jiang sound promising. Let me quote him:
Perhaps set "/sys/block/mdx/md/group_thread_cnt" could help here,
see below commits:
commit b721420e8719131896b009b11edbbd27d9b85e98
Author: Shaohua Li <shli@xxxxxxxxxx>
Date: Tue Aug 27 17:50:42 2013 +0800
raid5: sysfs entry to control worker thread number
commit 851c30c9badfc6b294c98e887624bff53644ad21
Author: Shaohua Li <shli@xxxxxxxxxx>
Date: Wed Aug 28 14:30:16 2013 +0800
raid5: offload stripe handle to workqueue
Regards.
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
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