Garrett Wollman wrote: > <<On Tue, 9 Oct 2012 20:18:00 -0400 (EDT), Rick Macklem > <rmack...@uoguelph.ca> said: > > > And, although this experiment seems useful for testing patches that > > try > > and reduce DRC CPU overheads, most "real" NFS servers will be doing > > disk > > I/O. > > We don't always have control over what the user does. I think the > worst-case for my users involves a third-party program (that they're > not willing to modify) that does line-buffered writes in append mode. > This uses nearly all of the CPU on per-RPC overhead (each write is > three RPCs: GETATTR, WRITE, COMMIT). > Yes. My comment was simply meant to imply that his testing isn't a realistic load for most NFS servers. It was not meant to imply that reducing the CPU overhead/lock contention of the DRC is a useless exercise.
rick > -GAWollman _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
