lkml.org 
[lkml]   [2006]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: CSCAN vs CFQ I/O scheduler benchmark results

> The previous mail got scrambbled and hence I am resending this one
> again
>
Still. Here are the values, fit for 80 cols.

Latency (seconds)
CFQ CSCAN
seq reads 0.0116 0.0148
seq writes 0.0164 0.0092
seq r+w 0.0107 0.0169
rnd reads 0.1178 0.1043
rnd writes 0.0423 0.0473
rnd r+w 0.0605 0.0732

Throughput MB/sec
CFQ CSCAN
seq reads 19.062 14.553
seq writes 15.251 22.108
seq r+w 22.127 14.72
rnd reads 2.1197 2.394
rnd writes 1.0032 0.9304
rnd r+w 1.376 1.399

Excels at sequential writes, so it seems like a good idea to use CSCAN on a
target drive when doing `rsync disk1/ disk2/`, esp. for large
files.



Jan Engelhardt
--
-
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: 2006-06-11 12:12    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site