Alexey Popov wrote:
Hi.
Kris Kennaway wrote:
In the meantime there is unfortunately not a lot that can be done,
AFAICT. There is one hack that I will send you later but it is not
likely to help much. I will also think about how to track down the
cause of the contention further (the profiling trace only shows that
it comes mostly from vget/vput but doesn't show where these are
called from).
Actually this patch might help. It doesn't replace lockmgr but it
does fix a silly thundering herd behaviour. It probably needs some
adjustment to get it to apply cleanly (it is about 7 months old), and
I apparently stopped using it because I ran into deadlocks. It might
be stable enough to at least see how much it helps.
Sorry, I didn't try you patch yet but I have other news.
As mentioned in the description of your patch there is probably a
scalability problem with stat() syscall on FreeBSD.
Not as such, that was just a random example I chose to illustrate the
lockmgr problems I described earlier.
Try the patch I posted, it should help.
Kris
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