Date: Tue, 24 Sep 2013 14:12:05 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: IO Performance under VMware on LSI RAID controller Message-ID: <l1rvid$j0b$1@ger.gmane.org> In-Reply-To: <207F05D4-9D33-41E8-9258-6C47F266D892@gmail.com> References: <EC847303-6F76-44DE-916E-3C1C04F34773@gmail.com> <207F05D4-9D33-41E8-9258-6C47F266D892@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --6MUKxr58EfAMLngETMfV6CWSFFN3S6DWH Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 20/09/2013 15:08, Guy Helmer wrote: > On Sep 19, 2013, at 11:25 AM, Guy Helmer <guy.helmer@gmail.com> wrote: >=20 >> Normally I build VMware ESXi servers with enterprise-class WD SATA dri= ves and I/O performance in FreeBSD VMs on the servers is fine. >> Whenever I build a VMware ESXi server with a RAID controller, IO perfo= rmance is awful in FreeBSD VMs. I've previously seen this effect with VMw= are ESXi 3ware 9690SA-8I and 9650 RAID controllers, and now I'm seeing si= milar performance with a Dell 6/iR controller. >> >> Any suggestions would be appreciated. >> >> Guy >=20 > (Replying to self due to hint received off-list) >=20 > I seem to remember controllers mentioned previously by FreeBSD device d= river developers that don't deal well with large I/O requests. It turns o= ut that may be the case with VMware device drivers as well -- reducing th= e VMware Disk.DiskMaxIOSize value from its huge default of 32676KB to 32K= B seems to have helped. Disk ops/sec in the FreeBSD VM are now peaking ov= er 400/sec. Interesting that the problem shows only on RAID controllers. Do you have any ideas why this reduction helps (did you find a FAQ or a forum post)? The default RAID stripe size in LSI is 64 KiB, maybe it would help even further to align it also? --6MUKxr58EfAMLngETMfV6CWSFFN3S6DWH Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.21 (FreeBSD) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iKYEARECAGYFAlJBgZZfFIAAAAAALgAoaXNzdWVyLWZwckBub3RhdGlvbnMub3Bl bnBncC5maWZ0aGhvcnNlbWFuLm5ldDYxNDE4MkQ3ODMwNDAwMDJFRUIzNDhFNUZE MDhENTA2M0RGRjFEMkMACgkQ/QjVBj3/HSwqtQCdEs1nccVlzDTOv21yrIkkpTfP s8gAn31S/5nq3DJCr+PusjDrGX0hVsQ/ =RfCu -----END PGP SIGNATURE----- --6MUKxr58EfAMLngETMfV6CWSFFN3S6DWH--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?l1rvid$j0b$1>