Bug 214826 - Poor performance under heavy i/o:
Poor performance under heavy i/o:
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
x86_64 Linux
medium Severity high
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Assigned To: Brian Maly
Brian Brock
Depends On:
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Reported: 2006-11-09 12:21 EST by Bulent Tekcan
Modified: 2008-09-25 02:12 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2008-09-25 02:12:18 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Bulent Tekcan 2006-11-09 12:21:12 EST
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 

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.
Comment 2 Brian Maly 2007-02-08 16:41:07 EST
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

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