We are running postgresql databases on dell poweredge 6650 servers with 12 GB of memory. They are running Redhat 7.3, and we recently upgraded (as part of the redhat updates) the kernel from 2.4.18-27.7.xbigmem to 2.4.20-18.7bigmem.
Since updating to 2.4.20, we have had severe load problems when the server gets busy. The busiest process is usually kscand, and overall kscand and kswapd have the highest CPU utilization times. A recent test showed the servers to perform well after initial boot, up until the cache memory filled up (ie: almost no free memory left, applications using only about 0.5 GB, and cached mem using about 11.5 GB). After that kscand gets much busier and as the database use increases, load seems to escalate wildly. There appears to have been a change in the way VM is handled between kernel 2.4.18 and 2.4.20. Is there any documentation on this anywhere (we can't find any yet) and has anyone else had any problems running 2.4.20 on large memory systems? Is 2.4.20 recommended over 2.4.18 ? Any info or practical experiences would be much appreciated. Regards, Chris. -- Chris Miles -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
