-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Wed, May 30, 2007 at 12:48:22PM +0530, Dinesh K B wrote: > I am novice kernel programmer. My name is Dinesh and I am from India. Well > last day I was experimenting with blktrace utility benchmarking current file > system. I had a strange observation with regarding ext2 and ext3. > With the latest blktrace dated 21-May, the I obtained following logs for > ext2 and ext3. [...] > Even if the I/O queued and dispatched are almost same for both ext2 and > ext3, the number of commands queued and dispatched is different for both. > > For ext3 Number of writes queued = 11,419 K, writes dispatched = 97,257. > > For ext2 Number of writes queued = 316,003, writes dispatched = 104,976. > > I am not able to understand why ext3 filesystem is queuing so many I/Os. ext3 might have the same on-disk structure as ext2, but it is a different filesystem. Things that will make a difference: - - journalling - - htree directory index I guess writing the journal will make the largest difference: every write that changes metadata will have to go through the journal. Erik - -- They're all fools. Don't worry. Darwin may be slow, but he'll eventually get them. -- Matthew Lammers in alt.sysadmin.recovery -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFGXVnB/PlVHJtIto0RAnA+AJ9YjVghmR3jEAeQ4p4tHpwc4eyhMwCfY4KM sui/t0E+Ghga6HC2HJmqAw0= =grHF -----END PGP SIGNATURE----- -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
