2011/7/24 Jens Axboe <jaxboe@xxxxxxxxxxxx>: > On 2011-07-22 22:59, Dan Williams wrote: >> Some storage controllers benefit from completions always being steered >> to the strict requester cpu rather than the looser "per-socket" steering >> that blk_cpu_to_group() attempts by default. >> >> echo 2 > /sys/block/<bdev>/queue/rq_affinity > > I have applied this one, with a modified patch description. > > I like the adaptive solution, but it should be rewritten to not declare > and expose softirq internals. Essentially have an API from > kernel/softirq.c that can return whether a given (or perhaps just local) > softirq handler is busy or not. Jens, I posted a similar patch about two years ago( http://marc.info/?l=linux-kernel&m=126136252929329&w=2). At that time, you actually did a lot of tests and said the same cpu approach will cause huge lock contention and bounce. Is that get fixed? Thanks, Shaohua -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
