Re: test7-pre4 tcp memory pressure

From: Patrick Schaaf (bof@bof.de)
Date: Tue Aug 29 2000 - 01:53:23 EST


> However, I'd be glad if you could tell me why my writes block that
> long. I'm certainly under 128MB of socket buffers, so the limits
> (on my 1GB machine) should not be reached.
>
> How certain are you?

99% - unless the kernel counts unused timewait slab entries against
the allocations. I tested with an otherwise idle machine, using 1000
connections of 14kB each, and the writes are degraded from the start.
That's nowhere near 128MB (32k * PAGE_SIZE).

> Why don't you add debugging to the kernel
> so that you know it as a fact?

The box is 30 min away. :-)

> Come back when this experiment completes ;-)

Will do.

Patrick
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