On Fri, Sep 30, 2005 at 11:43:51PM -0300, Pedro Fernandes Macedo wrote: > Hello guys. I think I've stumbled across something weird. > My brother updated his machine today and since then he started to have > horrible IO performance with kernel-2.6.13-1.1526_FC4. For example, > transfering his stuff to my computer as a backup (we started to suspect > the HDDs were going to stop working), the max speed with latest kernel > was below 1MB/s. With 2.6.12-1.1456_FC4, transfer speed is over 3MB/s > according to the ssh client I'm using right now. > Not to mention the average responsiveness of the system (a ssh login > with 1526 took about 10-20 seconds to show the login prompt, while with > 1456 the prompt shows up immediately. > > Any ideas on how I can test this to confirm if this is a bug or just > faulty hardware? I'm going to run a full smart test on the discs > tomorrow and a few RAM checks just in case, but the short test from > smart passed without any problems and the smart reports shows no > parameter outside the limits. What kind of disk controller ? If IDE, is DMA enabled ? It would be interesting to see the output of .. <boot old kernel> dmesg -s 128000 >dmesg.old <boot new kernel> dmesg -s 128000 >dmesg.new diff -u dmesg.old dmesg.new Dave
