Comment 297 for bug 595047
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bbfa235
(Get the code!)
(In reply to comment #261)
Brandon, this test case doesn't seem to reproduce any significant latency issues for you. I suspect that 10k RPM disk is able to write fast enough to keep a significant amount of data from being buffered in memory. 1.5 seconds isn't great, but all my systems are at least 5 times worse than that and often 10-40 times worse.
Do you notice a large latency hit on the system when the large write is running?
Why are you running that second small write afterwards? Was the big write done at that point or not? The latency of your small writes does seem to vary by quite a bit.