Messages in this thread |  | | Date | Tue, 10 Jun 2003 11:20:03 +0200 | From | Stefano Rivoir <> | Subject | IDE performances, 2.4 vs 2.5 |
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Noting that 2.5 is much slower than 2.4 on disk operations (you *touch* it when you have not-so-fast machine and use KDE, for example), I've written a silly test that fwrite/fread a single 100Mb file, char by char, and timing it I have results that I can't understand very well. Of course, same machine, same hdparm settings, same processes running (none, it's a notebook without server processes). I've run these test several time, the results are always more or less the same (ext2):
2.4.19
read: real 0m15.822s user 0m15.180s sys 0m0.270s
write: real 0m12.524s user 0m11.800s sys 0m0.690s
2.5.70 (up to -bk14, and -mm6)
read: real 0m20.790s user 0m14.372s sys 0m0.949s
write: real 0m13.148s user 0m11.901s sys 0m0.665
Writing does not drop, but reading has a 6 seconds difference between user+sys and real that I can't figure out. And the total difference is "huge". Actually, using anything that touches the disk (it can be a trivial "aptitude" loading the cache, or a complex KDE) slows down.
I've run these tests on a HP Omnibook w/Celeron, but I have the same slow down on a Athlon K7.
Is it anyway "normal", something I should expect upgrading from 2.4 to 2.5/2.6? Or there should be something I should check more accurately?
Bye all.
-- Stefano RIVOIR
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