Date: Sat, 07 Aug 2010 13:57:17 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: 8-STABLE Slow Write Speeds on ESXI 4.0 Message-ID: <i3jhn0$ovp$1@dough.gmane.org> In-Reply-To: <AANLkTi=FNZ%2B=4yMPJBu%2BucGJiHqwMwQvoGcgqB%2BtPJF2@mail.gmail.com> References: <AANLkTi=FNZ%2B=4yMPJBu%2BucGJiHqwMwQvoGcgqB%2BtPJF2@mail.gmail.com>
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On 7.8.2010 3:21, Joshua Boyd wrote: > Hello, > > I'm experiencing slow write speeds on 8-STABLE running on an ESXI 4.0 > server, despite whatever tunables I've thrown at it. Read speeds are slower > than they should be, but acceptable. Note, this is a thick provisioned disk, > not thin. > > Speeds on Windows hosts are as expected for an MD3000 DAS, 250MB/s or so. > > [root@git ~]# dd if=/dev/da0 of=/dev/null bs=1M count=500 > 500+0 records in > 500+0 records out > 524288000 bytes transferred in 3.304514 secs (158658118 bytes/sec > > [root@git ~]# dd if=/dev/zero of=/var/testfile bs=1M count=500 > 500+0 records in > 500+0 records out > 524288000 bytes transferred in 52.083421 secs (10066313 bytes/sec) I assume you are using UFS and SU? What tunables have you tried? 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.
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