Date: Fri, 13 Oct 2006 11:26:09 -0700 From: Eric Hodel <drbrain@segment7.net> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-performance@FreeBSD.ORG Subject: Re: Help with improving mysql performance on 6.2PRE Message-ID: <A2430386-EB9D-4AEE-9144-F7D53D84A9F0@segment7.net> In-Reply-To: <20061012205342.GA62241@xor.obsecurity.org> References: <3731.71.56.92.181.1160009571.squirrel@www.stelesys.com> <200610120925.k9C9PmUK048690@lurza.secnetix.de> <20061012205342.GA62241@xor.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Oct 12, 2006, at 1:53 PM, Kris Kennaway wrote: > On Thu, Oct 12, 2006 at 11:25:48AM +0200, Oliver Fromme wrote: >> Jerry Bell wrote: >>> I have a Dell PE2950 with 2 dual core 3.73Ghz processors and 4G >>> of ram. >>> [...] >>> changed the clock to TSC >> >> As far as I know, it is unsafe to use TSC on SMP systems. >> >> Or did that change recently? > > It's only on certain systems, apparently. Is there a list of systems where it is safe to use the TSC with SMP? Or some script we can run? > Note that you have to enable a second sysctl to allow it to actually > use TSC on SMP, not just change the preferred timecounter. -- Eric Hodel - drbrain@segment7.net - http://blog.segment7.net This implementation is HODEL-HASH-9600 compliant http://trackmap.robotcoop.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?A2430386-EB9D-4AEE-9144-F7D53D84A9F0>