On Thu, 7 Mar 2002, Alan Cox wrote:
| > BTW, this doesn't seem like a preemption issue, considering that throughput
| > is very definitely affected as well as latency.
| >
| > Anyway, please let me know if there's anything I can do, within my
| > constraints, to help. (As you can guess, though, I don't have any kernel
| > debugging experience.)
|
| It sounds like the hit you are taking is from highmem and I/O (having to
| copy pages lower into memory so the I/O subsystem can use them). Some of
| that is in the hard to fix for 2.4 category with the x86. There are some
| experimental patches around but they are experimental.
| -
I don't recall what kernel version you are using..?
Andrea now maintains the block-highmem 2.4 patches.
Latest is available at:
http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19pre2aa1/
and file: 00_block-highmem-all-18b-5.gz
If you can apply this patch, I'd be interested in the results.
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