lkml.org 
[lkml]   [2004]   [Mar]   [29]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateMon, 29 Mar 2004 13:42:10 +0200
FromPavel Machek <>
SubjectRe: [PATCH] speed up SATA
Hi!

> >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 195.113.31.123: icmp_seq=28 ttl=51 time=448769.1 ms         

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:02    [from the cache]
©2003-2008