Date: Fri, 20 Sep 2013 08:08:07 -0500 From: Guy Helmer <guy.helmer@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: IO Performance under VMware on LSI RAID controller Message-ID: <207F05D4-9D33-41E8-9258-6C47F266D892@gmail.com> In-Reply-To: <EC847303-6F76-44DE-916E-3C1C04F34773@gmail.com> References: <EC847303-6F76-44DE-916E-3C1C04F34773@gmail.com>
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[-- Attachment #1 --] On Sep 19, 2013, at 11:25 AM, Guy Helmer <guy.helmer@gmail.com> wrote: > Normally I build VMware ESXi servers with enterprise-class WD SATA drives and I/O performance in FreeBSD VMs on the servers is fine. > Whenever I build a VMware ESXi server with a RAID controller, IO performance is awful in FreeBSD VMs. I've previously seen this effect with VMware ESXi 3ware 9690SA-8I and 9650 RAID controllers, and now I'm seeing similar performance with a Dell 6/iR controller. > > Any suggestions would be appreciated. > > Guy (Replying to self due to hint received off-list) I seem to remember controllers mentioned previously by FreeBSD device driver developers that don't deal well with large I/O requests. It turns out that may be the case with VMware device drivers as well -- reducing the VMware Disk.DiskMaxIOSize value from its huge default of 32676KB to 32KB seems to have helped. Disk ops/sec in the FreeBSD VM are now peaking over 400/sec. Guy [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQEcBAEBCgAGBQJSPEi3AAoJEJmJzK+PHOvEI+gH/0BgCPglx/F0vyLR3QrwpGy9 nVh1PNSXKL72Dl/ncXgmx/Bfc44QaQN7oo1MhOaps/XvRf7RuoyTIIuAij9/5AhP FuKDf6zM2Q9Z9l41ECS4Z1dngGkL5HnaLxkDw9IrzocvcVOsc87kNhDJSZ6jljTP tAtPppegcSU8jLfHRzGaTnCpR68zk34X9BAoXmsdJERf75ElDcW/vtR6+wryJCRO 7iU3dEUt+1X/0cjIbFbGZkZ+ocSlvG6upis6yfbT0iRIT1Cn7V2E3ugCnw70UXgj GfQdH4VevLnhIFQwdXkZmVJSB99vwvgBLWAj5A2kB3S3vCqMpr+dh1M3enr1hLA= =XQJ1 -----END PGP SIGNATURE-----
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