Date: Mon, 10 Jan 2000 04:48:08 +0100 (CET) From: Christian Carstensen <cc@devcon.net> To: "Dave J. Boers" <djb@Wit389306.student.utwente.nl> Cc: freebsd-current@freebsd.org Subject: Re: freezing... Message-ID: <Pine.BSF.4.10.10001100435320.367-100000@pauling.research.devcon.net> In-Reply-To: <20000110032017.A499@relativity.student.utwente.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
> > this runs stable for 3 hours now... > > try a current kernel (checked out 4 hours ago), using a version of the > > file /usr/src/sys/pci/ahc_pci.c from 2000/01/06. ok, maybe it's not by any > > means stable, but works better than everything else within the last 24 > > hours. grrr, after 10 mins fsck... i was wrong. > Problem is that the lockups (I think) are ahc-related and my SCSI hard > drive did refuse to come online on one or two occasions while booting the > system cold... I therefore concluded that it might be a problem with the > hardware. Now (with the new kernel) I find the scsi system unstable and I > have doubts again. i'm using a ahc 7895 onboard on a tyan thunder 100. i've seen my cdrom occasionally not coming up until power cycling. is this a known bug with that controller? > One piece of information might also be useful in this context. After the > system lockup I sort of benchmarked the scsi performance by doing "dd > if=/dev/zero of=./testfile bs=1000000 count=128" (actually I varied the > blocksize) and got a _very poor_ performance of only 4 Mb/sec (which is > usually around 10 to 12 Mb/sec). I isolated my drive to be the only scsi > device and I even clocked the SCSI bus down from 20 Mhz to 8 Mhz, but to no > avail. scsi performance is very bad on my system for a long time now. operating on many small files, for example, my IBM DCAS-34330W is 100% busy with only 1.2 MB/s. i don't know why, but i suspect vinum in combination with some old scsi devices to cause that. -- Christian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.10.10001100435320.367-100000>