Messages in this thread |  | | Date | Mon, 9 Sep 1996 21:55:22 +1000 (EST) | From | David Monro <> | Subject | Interesting SCSI messages |
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Yesterday I was messing around with a large file (just over 0.5 Gb - a CDROM image) and giving my scsi subsystem a thorough workout. While copying the file from one disk to another and back again I got lots of messages on the console of the form
Warning - running *really* short on DMA buffers
From what I read of the source this means that I could have potentially done a larger request in one hit but ran out of DMA memory - harmless in terms of safety, but potentially damaging to performance.
Also, just once while I was trying to do some other stuff as well while doing these large copies, I got
scsi0 : DANGER : abort_connected() called
which sounds rather more serious. However, the resulting copy was identical with the source image so it didn't appear to cause any damage.
Should the first message appear at the default debug level, or should it be relegated to, say, info or debug status? And what does the DANGER message actually mean?
Oh, this is using the 53c7,8xx driver (Drew's, not the BSD one) on a standard 810 board, with one drive being a Quantum Fireball and the other (the target when the DANGER message appeared) being an old Seagate ST41650 (which is a full height 5.25" drive from 1992, which still manages 2.6MB/s sustained). I did not have 10MHz mode enabled (lots of external cables). Doing anything at all on the system while the copy was running seemed to provoke lots of the Warning messages, which probably makes sense (more outstanding commands etc).
Just my 2 cents - this is a stable kernel and we don't want to alarm the punters too much now do we :-)
David
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