Messages in this thread | | | Date | Mon, 07 Jan 2002 15:20:07 +0100 (CET) | From | Giuliano Pochini <> | Subject | RE: [patch, CFT] improved disk read latency |
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> + if (__rq->elevator_sequence-- <= 0) { > + /* > + * OK, we've exceeded someone's latency limit. > + * But we still continue to look for merges, > + * because they're so much better than seeks. > + */ > + merge_only = 1;
That's true for hard discs, but for most removables seek time is small compared to write time. Think about a magneto-optical drive or a ZIP. Seek is about 20-50ms while writing goes at 300-1000KiB/s.
Bye.
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