lkml.org 
[lkml]   [2001]   [Oct]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectWrite throughput in >= 2.4.10
From
Date
It looks like recent kernels have some serious trouble during simple
writing of files. Throughput is cut to half.

2.4.12-ac3 (Riel VM):

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 1 0 2548 7652 369104 0 0 0 21992 291 592 0 23 77
0 4 1 0 2556 7652 369104 0 0 0 22500 280 175 0 3 97
0 4 1 0 3064 7652 368588 0 0 8 19644 278 202 0 4 96
...

2.4.13-pre4 (Andrea/Linus VM):

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 1 1 30312 2884 2304 384076 0 28 0 7784 199 241 0 12 88
0 1 1 30316 2068 2256 385772 0 132 4 7900 186 188 1 8 91
0 1 0 30316 3960 2232 384140 0 0 8 6744 179 204 0 4 96
...

'bo' column is the one to check out... I copied just 3 lines, but they
are all alike. 2.4.13-pre ends up with 11MB/sec, where -ac kernels are
over 20MB/sec (during sequential writing of big files - ext2 of course).

Also it looks like pre4 swaps when it is not necessary to do so. With
380MB in page cache I don't expect any swap traffic at all.
--
Zlatko
-
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 13:08    [W:0.033 / U:3.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site