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Old 02-04-2004, 07:11 AM   #1
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Registered: Feb 2004
Location: India
Distribution: RedHat
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linux 2.4.20-8smp NAPI

I have installed RedHat Linux 9.0 (2.4.20-8 smp) on two different machines. On one of them, which is a dual processor pentium III, softirqs are being handled by all the CPUs. On the other machine which is a dual processor Xeon machine, softirqs are being handled by only CPU0. I have only one NIC on both the machines. Xeon machine is having Intel PRO 1000 Desktop adapter while Pentium III machine is using Broadcom Tigon3 NIC. Why is the softirq handling behaviour different in both machines. I installed same version and release of linux on both of them.

Also is it possible to specify this behaviour at install time if I want both CPUs of my Xeon machine to handle softirqs.

Thank you
Old 02-04-2004, 11:06 AM   #2
LQ Guru
Registered: Feb 2003
Location: Blue Ridge Mountain
Distribution: Linux Mint 17, Debian 8
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"Why is the softirq handling behaviour different in both machines."

One possibility could be that the two machines have different kernels. If one computer has Intel CPUs and the other has AMD CPUs then Red Hat probably installed two different kernels on the two machines. Check /boot on each machine for the name of the kernel that machine is running. As a byproduct of having two different kernels, some of the kernel parameters such as whether to use softrqes may have been compiled differently by Red Hat. You can probably standardize your two kernels more if you compile your own.

Be prepared. Create a LifeBoat CD.

Steve Stites


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