Date: Mon, 16 Sep 2002 10:20:33 -0500 (CDT) From: Sean Farley <sean-freebsd@farley.org> To: "David C. Snyder" <dsnyder@ws-e.com> Cc: freebsd-stable@FreeBSD.ORG, Orlando Lewis <Orlando.Lewis@cnn.com> Subject: Re: Slow I/O responsiveness with UDMA133 Message-ID: <20020916093527.Q271-100000@thor.farley.org> In-Reply-To: <20020916032851.W15524-100000@atl02.ws-e.com>
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On Mon, 16 Sep 2002 03:48, David C. Snyder wrote: > Hello Sean, > > I've noticed the same thing with HighPoint HPT370 and Promise > FastTrack 100 TX2 IDE RAID controllers. Last weekend, I did some > testing with these two controllers and a 3WARE Escalade 7210. Both > the HighPoint and the Promise seemed to have poor mixed I/O > performance. For example, if I used dd to create a 4 GB file in one > window, and I ran a find command on /usr in the other, the find > command would output a few lines, then pause for five seconds, then > spit out a few more lines, etc. Logins were also very slow while the > dd was running. Once the dd finished, the find command raced along! Misery loves company. :) I noticed that with dd and logins as well. > With the 3WARE, I could run many find commands while the dd was > running with no visible slowdown. The difference seems to be that the > HighPoint and Promise use the ata-raid code while the 3WARE uses a > different driver. It would be nice to know if the ATA performance > used to be better, but I don't have a non 4.6.2 system to run any > tests on. (although I guess I could build one...). > > My mid-term plan is to upgrade all of my that require good I/O > performance to 3WARE RAID. Please let me know if you find a software > solution. As I am not using RAID, I doubt that it is in the RAID code. It appears that 3WARE does not use the ata driver. My guess from afar is that the problem exists within the non-RAID ata driver. Of course, that is an uninformed guess. Sean ----------------------- sean-freebsd@farley.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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