lkml.org 
[lkml]   [1998]   [Mar]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Patch for block write clustering
On Wed, 4 Mar 1998, Emil Briggs wrote:

> Yes, I started looking through the lower-level code. I am puzzled though
> as to why the low-level sorting doesn't seem to have much effect in 2.0.33
> at least. Using a stock 2.0.33 kernel with write-caching turned off on the
> drive itself causes a huge performance hit. (I can post the benchmark program
> I used if anyone wants to try it themselves)

One new 2.1.x function in the sort code is attempt_merge() in
drivers/block/ll_rw_blk.c. I doubt that it accounts for the difference,
but perhaps -- we can try adding a printk() to that function, and verifying
whether it is called frequently under the benchmark.

Gadi

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu

\
 
 \ /
  Last update: 2005-03-22 13:41    [W:0.017 / U:1.420 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site