On Sat, Aug 7, 2010 at 1:58 PM, Ivan Voras <[email protected]> wrote:
> On 7 August 2010 19:03, Joshua Boyd <[email protected]> wrote: > > On Sat, Aug 7, 2010 at 7:57 AM, Ivan Voras <[email protected]> wrote: > > >> It's unlikely they will help, but try: > >> > >> vfs.read_max=32 > >> > >> for read speeds (but test using the UFS file system, not as a raw device > >> like above), and: > >> > >> vfs.hirunningspace=8388608 > >> vfs.lorunningspace=4194304 > >> > >> for writes. Again, it's unlikely but I'm interested in results you > >> achieve. > >> > > > > This is interesting. Write speeds went up to 40MBish. Still slow, but 4x > > faster than before. > > [r...@git ~]# dd if=/dev/zero of=/var/testfile bs=1M count=250 > > 250+0 records in > > 250+0 records out > > 262144000 bytes transferred in 6.185955 secs (42377288 bytes/sec) > > [r...@git ~]# dd if=/var/testfile of=/dev/null > > 512000+0 records in > > 512000+0 records out > > 262144000 bytes transferred in 0.811397 secs (323077424 bytes/sec) > > So read speeds are up to what they should be, but write speeds are still > > significantly below what they should be. > > Well, you *could* double the size of "runningspace" tunables and try that > :) > > Basically, in tuning these two settings we are cheating: increasing > read-ahead (read_max) and write in-flight buffering (runningspace) in > order to offload as much IO to the controller (in this case vmware) as > soon as possible, so to reschedule horrible IO-caused context switches > vmware has. It will help sequential performance, but nothing can help > random IOs. > Hmm. So what you're saying is that FreeBSD doesn't properly support the ESXI controller? I'm going to try 7.3-RELEASE today, just to make sure that this isn't a regression of some kind. It seems from reading other posts that this used to work properly and satisfactorily. -- Joshua Boyd JBipNet E-mail: [email protected] http://www.jbip.net _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
