Re: [PATCH] speed up SATA

From: Pavel Machek
Date: Mon Mar 29 2004 - 07:37:54 EST


> >What about latency?
> merged transfer will top out at 8MB. You don't see that unless
> you're on a totally quiet machine with tons of free, contiguous
> pages. So in practice it winds up being much smaller, the more
> loaded the system gets (and pagecache gets fragmented).
> Latency definitely changes for the default case, but remember that a
> lot of that is writeback, or streaming writes. Latency-sensitive
> applications already know how to send small or no-wait I/Os, because

Well, waiting second for read because 32MB write is being done
will not be fun...
64 bytes from icmp_seq=28 ttl=51 time=448769.1 ms

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