| Date | Wed, 20 Mar 2013 13:56:12 -0700 | Subject | Re: ipc,sem: sysv semaphore scalability | From | Linus Torvalds <> |
| |
On Wed, Mar 20, 2013 at 1:49 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > > It *would* be lovely to see this run with the actual Swingbench > numbers. The microbenchmark always looked much nicer. Do the > additional multi-semaphore scalability patches on top of Davidlohr's > patches help with the swingbench issue, or are we still totally > swamped by the ipc lock there? > > Maybe there were already numbers for that, but the last swingbench > numbers I can actually recall was from before the finer-grained > locking..
Ok, and if the spinlock is still a big deal even with the finer granularity, it might be interesting to hear if Michel's fast locks make a difference. I'm guessing that this series might actually make it easier/cleaner to do the semaphore locking using another lock, since the ipc_lock got split up and out...
I think Michel did it for some socket code too. I think that was fairly independent and was for netperf.
Linus
|