On Sat, 23 Feb 2008 12:20:12 +0100 (CET) Nikola Ciprich <extmaillist@xxxxxxxxxxx> wrote: > Hi, > > I've found strange problem either in arcmsr driver, or maybe in > areca-1660 card... > When system on SAS discs RAID connected to areca-1660 card > gets under heavy I/O load, it gets unusable after some time. I can 100% reproduce > this, although it needs quite speciffic conditions: > It can be reproduced on 2x quad core machine, RAM has to be limited to > ~192MB to cause heavy paging. > Only thing needed to cause the problem is to start loop doing kernel > compilation using make -j 8 - this loads the system heavily, because of > lack of memory. After few correct compile runs the system gets into > state when all programs including the basic ones (ls, cp, ..) start > crashing... dmesg (when it works) doesn't say anything strange... > After reboot, the system is OK again. > I have tested it on different motherboards, with different CPUs, RAMs(all > were properly tested with memtest), with two different areca cards and > different drives. I can't reproduce the problem on same hardware when > using different RAID card (ie adaptec). All testing systems were properly > cooled.. > I have tried all available areca firmwares, two different distributions > (oracle linux, and centos), and kernels ranging from distribution ones, to last GIT snapshot. > Could somebody please give me some hints on how to hunt this problem? > Areca support doesn't seem to be very interested in the problem :-( (cc's added) Please get the machine into this state of memory exhaustion then take copies of the output of the following, and send them via reply-to-all to this email: - cat /proc/meminfo - cat /proc/slabinfo - dmesg -c > /dev/null ; echo m > /proc/sysrq-trigger ; dmesg -c Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
