Messages in this thread | | | From | "Ben Israel" <> | Subject | File System Performance | Date | Mon, 12 Nov 2001 08:54:57 -0500 |
| |
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/
| |