Poor performance under heavy i/o: 2.6.9-42.0.3.ELsmp #1 SMP Mon Sep 25 17:24:31 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux Our sites high traffic on theplanet,we have a Dual Opteron 4GB ram.Under high traffic this error occured. Nov 9 17:22:23 imagine su(pam_unix)[5976]: session closed for user root Nov 9 17:22:46 imagine kernel: warning: many lost ticks. Nov 9 17:22:46 imagine kernel: Your time source seems to be instable or some driver is hogging interupts Nov 9 17:22:46 imagine kernel: rip __do_softirq+0x4d/0xd0 How reproducible: I cannot reproduce,because only under higf traffic this error occured.After this problem my system unstable load goes high,and cpu %2 to 80 jumping.
What timesource is being used here (dmesg|grep time)? Does the error go away if a different timesource is used? Can you try booting with each of the following boot args (one at a time) and see if any make a difference: acpi_irq_balance, noirqbalance and idle=poll