Date: Tue, 27 Mar 2007 09:22:17 +0200 From: Marc Santhoff <M.Santhoff@t-online.de> To: Mikhail Teterin <mi+kde@aldan.algebra.com> Cc: stable@freebsd.org Subject: Re: pitiful performance of an SATA150 drive Message-ID: <1174980137.336.5.camel@localhost.das.netz> In-Reply-To: <200703261436.28659@aldan> References: <200603010505.k2155HfQ003205@aldan.algebra.com> <44054C5E.5070902@deepcore.dk> <200603011107.09942@aldan> <200703261436.28659@aldan>
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Am Montag, den 26.03.2007, 14:36 -0400 schrieb Mikhail Teterin: > Over a year later this remains a problem -- exactly as described below... > > No other SATA devices are present -- the only other IDE device is the DVD > drive. My main disks are SCSI. > > What's MUCH worse is that the (slowly) written data is also often corrupted... > I use the drive to store our vast collection of photos and the backups. Every > once in a while I encounter a corrupt JPEG file, and the backups are _always_ > corrupt somewhere. Doing something like: > > dump 0auChf 16 0 - /home | bzip2 -9 > /store/home.0.bz2 > > always produces a corrupt file (as per ``bzip2 -t''). I used to blame the > drive's temperature, but it now sits in its own enclosure and stays under 40 > Celsius. > > When the drive is accessed, there are (according to `systat -vm') many > thousands of interrupts 17 -- on my system these are shared between pcm0 and > ehci0. Why are these triggered by accessing SATA is unclear, but the Intr's > share of the CPU time is often above 80% of one processor's total (I have 4 > processors). > > As I mentioned a year ago, Knoppix was accessing the same drive at much higher > speeds, so I don't believe, the problem is with the hardware... > > Please, advise. Thanks! FWIW: You could try cleaning the connectors and use a fresh new cable for the connection (the spec has a very small value for plugging the connectors at the cable). I had massive problems and got rid of them that way ... Marc
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