lkml.org 
[lkml]   [2001]   [Nov]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectFile System Performance
Date
My System:
Pentium III 800MHz
128M SDRAM
Aug 2001 MSC Linux
XFS File System

My Results:
hdparm /dev/hda

/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 3739/255/63, sectors = 60074784, start = 0

hdparm -t /dev/hda

/dev/hda:
Timing buffered disk reads: 64 MB in 2.71 seconds = 23.62 MB/sec

time cp -r /usr/src/linux-2.4.6 tst

real 0m47.376s
user 0m0.180s
sys 0m2.710s

du -bs tst
144187392 tst

Actual Performance
2*144MB/48s=6MB/sec

Notes:
1) for consistent results; data size should exceed file cache.
2) cp reads and writes files: so 2*3MB/sec = 6MB/sec fileio on a 24MB/sec
drive

My Questions:
Is there a way of identifying what the file system is doing here?
Is there a way to improve it?
What tools are there to identify and time the raw disk io done by the file
system?





-
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 13:13    [W:0.100 / U:7.812 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site