On Thu, 7 Mar 2013 15:31:23 +0800 Shaohua Li <shli@xxxxxxxxxx> wrote: > Hi Neil, > > I just noticed this one is missed. It used to be in your branch, but get > dropped some time. Is anything I missed? I can resend it if you like. > > Thanks, > Shaohua > > On Thu, Aug 09, 2012 at 04:58:08PM +0800, Shaohua Li wrote: > > This is a new tempt to make raid5 handle stripes in multiple threads, as > > suggested by Neil to have maxium flexibility and better numa binding. It > > basically is a combination of my first and second generation patches. By > > default, no multiple thread is enabled (all stripes are handled by raid5d). > > > > An example to enable multiple threads: > > #echo 3 > /sys/block/md0/md/auxthread_number > > This will create 3 auxiliary threads to handle stripes. The threads can run > > on any cpus and handle stripes produced by any cpus. > > > > #echo 1-3 > /sys/block/md0/md/auxth0/cpulist > > This will bind auxiliary thread 0 to cpu 1-3, and this thread will only handle > > stripes produced by cpu 1-3. User tool can further change the thread's > > affinity, but the thread can only handle stripes produced by cpu 1-3 till the > > sysfs entry is changed again. > > > > If stripes produced by a CPU aren't handled by any auxiliary thread, such > > stripes will be handled by raid5d. Otherwise, raid5d doesn't handle any > > stripes. Hi Shaohua, I still have this sitting in my queue, but I haven't had a chance to look at is properly yet - I'm sorry about that. I'll try to get to it soon. NeilBrown
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