<<On Tue, 12 Mar 2013 23:48:00 -0400 (EDT), Rick Macklem <rmack...@uoguelph.ca> said:
> Basically, this patch: > - allows setting of the tcp timeout via vfs.nfsd.tcpcachetimeo > (I'd suggest you go down to a few minutes instead of 12hrs) > - allows TCP caching to be disabled by setting vfs.nfsd.cachetcp=0 > - does the above 2 things you describe to try and avoid the livelock, > although not quite using an lru list > - increases the hash table size to 500 (still a compile time setting) > (feel free to make it even bigger) > - sets nfsrc_floodlevel to at least nfsrc_tcphighwater, so you can > grow vfs.nfsd.tcphighwater as big as you dare Thanks, this looks very good. One quibble with the last bit: I'd do that in a sysctl() handler rather than checking it every time through. If somebody uses a debugger rather than sysctl to change tcphighwater, they deserve what's coming to them. Also, I might suggest adding a counter for how many times we had to go through the "try harder" phase, so that the sysadmin has some indication that the defaults need adjustment. I will test this out later this week and see how it performs. I have a user who has been able to reproducibly clobber servers before, so if he has time and cycles available it should be pretty easy to tell whether it's working or not. -GAWollman _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
