On Saturday 22 December 2007, Brett Glass wrote: > I will need to build several Web caches over the next few months, > and just took advantage of the Christmas lull (and a snowy day, > when I couldn't work outside) to test FreeBSD 7.0 BETA 4 to see how > it will perform at this task. I built up a 4 core FreeBSD box, and > asked a friend who's a Linux fanatic to do the same with Linux on > identical hardware. I didn't watch closely how he installed > everything, but asked him not to tune it beyond setting it up > properly for SMP. > > We then ran a test suite in which a client starts several > processes. Each uses wget to fetch a series of objects in rapid > succession via the cache. The fetches done by each process are the > same batch of URLS, but shuffled differently, so each URL will get > a miss the first time and then hits each time it comes up > thereafter unless the cache overflows. We're doing all GETs, with > no tricky stuff like subranges. > > As has been reported in some other messages on this list, Linux is > currently blowing FreeBSD away. It's taking as much as 20% less > time to get through the benchmark, depending on exactly how the > random shuffle came out. This is with 4 GB RAM, the GENERIC FreeBSD > SMP kernel (using SCHED_ULE), and aufs as the storage schema for Squid. > > It appears, though I'd need to instrument the code more to be sure, > that the slowdown is coming from file I/O. Could it be that there > less concurrency or more overhead in FreeBSD file operations than > there is in Linux? Even with SoftUpdates turned on, the cache > volume mounted with -noatime, and aufs (which uses kqueues -- a > FreeBSD invention -- to optimize multithreaded disk access), the > benchmark shows FreeBSD losing out. Why?
Since you're using the fs as a cache, I presume it wouldn't be a big problem if the data was lost by a power outage (or crash). If so, you can try the async mount option to seriously increase fs performance. Pieter de Goeje _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
