Messages in this thread | | | Date | Fri, 25 Jul 1997 02:58:49 +0200 | From | Andries.Brouwer@cwi ... | Subject | Re: 2.0.30 serial.c, ppp.c and pppd-2.2 questions |
| |
Theodore Y. Ts'o:
: Date: Thu, 24 Jul 1997 00:06:25 +0200 : From: Andries.Brouwer@cwi.nl
: Possibly entirely unrelated (you are talking about missed timer interrupts, : probably I am talking about missed serial line interrupts) but : my SLIP connection is completely unusable when something disk-intensive : is running. FTP gets into an exponential backoff and seems to hang : completely, but recovers some time after the make/find/whatever has : finished.
: [This happens both with IDE and SCSI activity. I never really : investigated.]
: At least for the IDE case, this is the very well known problem of the : IDE driver disabling interrupts to prevent data corruption in a few : badl;y designed IDE controllers. If you don't have the bad IDE : controllers (see the man page for more details), you will likely be able : to use "hdarm -u 1" which will fix the problem without causing your : disks to get massively corruption.
: As far as the SCSI activity, my guess it is a similar problem, but the : solution to solve it is very dependent on the SCSI manufacturer.
: - Ted
You are an optimist. (On the one hand "hdparm -u 1" does cause corruption here, on the other hand, it doesnt help at all.)
Suppose something is wrong in the scheduler, and processes with finished disk I/O get too much attention. I just showed my son how an e2fsck on a large SCSI disk really stopped all other activity.
Andries
| |