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SubjectRe: Degrading disk read performance under 2.2.16
On Mon, 14 Aug 2000, Jens Axboe wrote:

>> I found that increasing the read_latency to match write_latency fixes the
>> problems perfectly - thanks for the pointer!
>
>Ok good. Andrea, could we bump read latency in 2.2.17-pre?

Yes.

>> Increasing the read_latency and write_latency to 10,000,000 results in
>> similar throughput, but catastrophic seek performance:
>
>Odd...

I guess it was the tiotest "Seek" bug that I mentioned in the other email.

>to backup the values chosen. But the current defaults do impose performance
>problems, as they did in 2.4, so I think that up'ing read latency is
>a good idea.

Agreed.

Andrea


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