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