Messages in this thread | | | Date | Wed, 04 Aug 1999 11:24:21 -0700 | From | Dave Campbell <> | Subject | kernel issue |
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We are running Redhat linux 6.0 kernel 2.2.5-15 on a dual-processor pentium machine. We have encountered performance problems while running a large Solid database. There is a well-documented problem with fsync, especially on machines with lots of memory (500 Meg), and we therefore recently applied a kernel patch and rebuilt the kernel.
We were able to build and install the kernel, and the system has been running for 24 hrs with the new kernel, and there are several indications that the performance has indeed been enhanced. However, the klogd daemon, which logs kernel errors has been consistantly using about 50% of one of our processors. Running dmesg to see the 'kernel-ring' errors gave the following output, which implicates the SCSI controller on our machine. Over and over and over and .....
ncr53c810a-0:1: ERROR (0:18) (1-21-31) (8/13) @ (script 7ac:19000000). ncr53c810a-0: script cmd = 89030000 ncr53c810a-0: regdump: da 10 80 13 47 08 01 1f 0e 01 81 21 80 00 91 00. ncr53c810a-0: have to clear fifos. ncr53c810a-0: restart (scsi reset). ncr53c810a-0-<1,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<3,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<2,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<4,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0:1: ERROR (0:18) (1-21-81) (8/13) @ (script 6ac:19000000). ncr53c810a-0: script cmd = 89030000 ncr53c810a-0: regdump: da 10 80 13 47 08 01 1f 32 01 81 21 80 01 91 00. ncr53c810a-0: have to clear fifos. ncr53c810a-0: restart (scsi reset). ncr53c810a-0-<1,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<3,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0:1: ERROR (0:18) (1-21-b6) (8/13) @ (script 90c:19000000). ncr53c810a-0: script cmd = 89030000 ncr53c810a-0: regdump: da 10 80 13 47 08 01 1f 16 01 81 21 80 00 91 00. ncr53c810a-0: have to clear fifos. ncr53c810a-0: restart (scsi reset). ncr53c810a-0-<1,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<2,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<3,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<4,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0:1: ERROR (0:18) (1-21-6) (8/13) @ (script 96c:19000000). ncr53c810a-0: script cmd = 89030000 ncr53c810a-0: regdump: da 10 80 13 47 08 01 1f 2a 01 81 21 80 01 91 00. ncr53c810a-0: have to clear fifos. ncr53c810a-0: restart (scsi reset). ncr53c810a-0-<1,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<3,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<2,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8) ncr53c810a-0-<4,*>: FAST-10 SCSI 10.0 MB/s (100 ns, offset 8)
I was unable to find info regarding this on various FAQs, and we believe we have specified the appropriate hardware. Does anyone understand this output or have any suggestions as to what we might try?
Thanks very much,
-dave campbell
-- David Campbell H: (425)747-4633 campbell@geospiza.com W: (206)633-4403 Geospiza, Inc. www.geospiza.com
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