Date: Fri, 8 Feb 2002 06:40:03 -0800 (PST) From: "Craig Stratton" <craig@avnet.co.uk> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/34711: frequent system stall under moderate scsi load Message-ID: <200202081440.g18Ee3f61695@freefall.freebsd.org>
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The following reply was made to PR kern/34711; it has been noted by GNATS. From: "Craig Stratton" <craig@avnet.co.uk> To: "David Malone" <dwmalone@maths.tcd.ie> Cc: <freebsd-gnats-submit@freebsd.org> Subject: Re: kern/34711: frequent system stall under moderate scsi load Date: Fri, 8 Feb 2002 14:34:03 -0000 David, i'm not sure if the system time is usual or not. But it sounds like it shouldn't be... It could be a memory problem, as you say, because it only has 64MB, but the previous system i ran exactly the same things on only had 16MB on a P75 IDE and had no problems. Uptime over 500 days before replacement with "better" hardware :-| Can't remember what release it was on though. Slightly earlier i believe. There is never anything logged anywhere whenever the system stalls or hangs, which is frustrating... I think the problem is certainly in the swapping/disk access area, as all disk operations seem to take a while. When it hangs, i can get ssh login, but no shell until it comes back. I was looking over how to upgrade "in situ" last night, but was too tired to take it in. Can you advise how i would go about bringing up to date online with no physical access to the machine ? (other than carefully .. ;-) ) The most i do normally is install from scratch, and add/configure software/applications.... ahc0: <Adaptec 2940 Ultra SCSI adapter> port 0x6000-0x60ff mem 0xe4000000-0xe4000fff irq 10 at device 9.0 on pci0 ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs pci0: <S3 Trio graphics accelerator> at 10.0 irq 9 da1 at ahc0 bus 0 target 1 lun 0 da1: <QUANTUM FIREBALL ST4.3S 0F0C> Fixed Direct Access SCSI-2 device da1: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled da1: 4136MB (8471232 512 byte sectors: 255H 63S/T 527C) da0 at ahc0 bus 0 target 0 lun 0 da0: <QUANTUM FIREBALL ST4.3S 0F0C> Fixed Direct Access SCSI-2 device da0: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled da0: 4136MB (8471232 512 byte sectors: 255H 63S/T 527C) Regards, Craig ----- Original Message ----- From: "David Malone" <dwmalone@maths.tcd.ie> To: "Craig Stratton" <craig@avnet.co.uk> Cc: <freebsd-gnats-submit@freebsd.org> Sent: Friday, February 08, 2002 1:48 PM Subject: Re: kern/34711: frequent system stall under moderate scsi load > All the processes are in a state where they are waiting for the > disk (inode, biord and getblk). The percentage system time is kinda > high too - is that typical of this system? > > Can you have a look at the output of dmesg and see if there is > anything mentioned around the stall time. Also, what type of SCSI > card do you have? The relivant lines from /var/log/dmesg.boot might > be useful. > > It is possible that the system is just running low on memory and > getting stuck trying to free it up. Matt Dillon made some improvements > in this area, which probably came in since 4.1... > > David. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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