Date: Tue, 17 Apr 2007 17:52:13 +0200 (CEST) From: "Gelsema, P \(Patrick\) - FreeBSD" <freebsd@superhero.nl> To: "Kris Kennaway" <kris@obsecurity.org> Cc: freebsd-current@freebsd.org Subject: Re: Difference between 6.2 and 7.0 Adaptec 39320D - 7.0 performing less Message-ID: <5073.195.50.100.20.1176825133.squirrel@www.superhero.nl> In-Reply-To: <20070417151829.GA1252@xor.obsecurity.org> References: <200704162247.29909.gelsemap@superhero.nl> <20070416230322.GA69661@xor.obsecurity.org> <49836.195.50.100.20.1176808326.squirrel@www.superhero.nl> <20070417151829.GA1252@xor.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, April 17, 2007 17:18, Kris Kennaway wrote: > On Tue, Apr 17, 2007 at 01:12:06PM +0200, Gelsema, P (Patrick) - FreeBSD > wrote: >> On Tue, April 17, 2007 01:03, Kris Kennaway wrote: <SNAP></SNAP> > > >> > Apparently you weren't paying attention during boot, because 7.0 ships >> > with heavy debugging options enabled, and tells you about it up front: >> > >> > "WARNING: WITNESS option enabled, expect reduced performance.\n"; >> > >> > Recompile your kernel with debugging options disabled before making >> > performance comparisons. >> > >> > Kris >> > >> >> Ok, what you are saying makes sense. I did see the warnings and the bits >> in the kernel config. The thing that triggered me was that when paying >> attention during boot the SCSI Disk was detected as only 160.00MB/s >> instead of the expected 320.00MB/s. The detection of devices is not >> subject to debugging, is it? > > Someone else pointed this out to me, to be honest I didn't get that > far in your email after noticing the big blunder of leaving debugging > enabled :) It's a lot of noise you get on lists, I completely understand your response, would have probably responded in the same way. Next time I'll write my emails a bit different ;-) > I agree that the different speed negotiation is a likely potential > cause of poor performance as well, but it really doesn't make sense to > be making performance comparisons when one system has all possible > debugging enabled and the other has no debugging enabled. I am leaving the debug options on to get as much info for you guys to help out. I am not comparing speed/performance at the moment. What I was doing was to see if getting the patch diff from Ed Schouten in - to get the SATA controller recognised - did change the performance. So I did a dd before patch and after patch. The patch allows the MCP61 to be recognised as such and use SATA300 instead of the UDMA33. (see mail sent yesterday to freebsd-current with subject:Follow up: Support for nVidia MCP61 (S)ATA controllers). Even with debugging on I would expect difference of performance. Main reason for installing 7 is seeing if my hardware is supported, toying a bit with new features, trying to get a better understanding of the whole. Rgds, Patrick
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5073.195.50.100.20.1176825133.squirrel>