One reason may be the location of the partitions. A low sector located partition is faster than one that lies at the end of the disk. Disks usually start counting outside
Sean Neakums schrieb:
Hi, I've been playing with JFS this past day or so, and I am observing a performance problem. I am using a patched kernel (version 14a of Rik van Riel's rmap VM), so this may be implicated somehow. When I do a build of the LNX-BBC (http://www.lnx-bbc.org/) I get a build time of about 75 minutes on an ext3 volume, and about 84 minutes on a JFS volume. I'm using stock ext3 and JFS version 1.10, on Linux 2.4.19 plus the rmap patch. Here's some data, from "time make install": On ext3: real 76m37.636s user 38m59.370s sys 18m34.210s On JFS: real 84m13.123s user 39m3.020s sys 18m49.810s The machine in question is an SMP box with 1.13GHz P-III, 256M of RAM and IDE disks. I use ccache (http//ccache.samba.org/) to do these builds, and see almost identical hit/miss statistics for each run. I believe that, due to ccache, the build becomes fairly I/O-bound. Judging by fact that the wall-clock time shows the only big variation, I'm guessing (wildly, with no proof) that this may be something to do with how JFS schedules I/O. If there is any other information you'd like me to gather, please holler.
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