24 Apr
2001
24 Apr
'01
12:47
Hi, For better performance when doing stuff like untars or kernel tree copies, run something like $ while true; do sync; done in a 2nd term. The reason for the boost is simple -- we want to keep our request queue full at all times, to allow the best merging possible. This usually happens (the request free batching helps a lot), but not always because bdflush doesn't push enough buffers out at once at seemingly random intervals. I've thought about doing pull-flushing before (rather than push flushing as it happens now) for other reasons in fact, however that would solve this issue completely too. More on this soon :-) -- Jens Axboe
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Jens Axboe