Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

Frank de Lange (frank@unternet.org)
Fri, 12 Jan 2001 01:28:39 +0100

On Thu, Jan 11, 2001 at 02:23:53PM -0500, Jeff Garzik wrote:
> Just out of curiosity, if you boot a Linux 2.4.0 kernel with the
> "noapic" command line option, does behavior improve?

For the curious, here's a summary of some tests I did:

apic, 2 cpu's, no smp affinity -> network hangs under load
apic, maxcpus=1, no smp affinity -> network hangs under load
apic, 2 cpu's, smp affinity for all irq's on CPU1 -> network hangs under load
noapic, 2 cpu's, no smp affinity -> NO HANG, WORKSFORME

Quick and dirty conclusion: as soon as the apic comes in to play, things get
messy...

ps. load == 2 simultaneous nfs cp -rd <big_directory> sessions and streaming
esd audio over the network

Cheers//Frank

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