On Wed, 2004-05-05 01:00:56 +0200, fabio <[EMAIL PROTECTED]> wrote in message <[EMAIL PROTECTED]>: > I have a MIATA PWS 500a with a custom Woody installation updated to SID, > SRM boot. Debian is installed on a 20G 7200 rpms IDE disk. > hdparm -t with a 2.2.x kernel reports a transfer rate of 1.3 MB/s > hdparm -t with a custom compiled 2.4.26 reports a transfer rate of 13 MB/s. > Ten times the 2.2.x transfer rate. Comparable to the transfer rate of the SCSI > disk connected to the Qlogic 1020 card. > All looks ok, dmesg, lspci, hardware detection (I get some depmod error, > see dmesg, but they looks benign). > > BUT I get strange filesystem (ext2) corruptions only with the 2.4.26 kernel. > Untarring the kernel sources I can see random binary data in the sources. > I also tried a 2.6.4 kernel but the filesystem corruption was so bad I had to > wipe the disk. > The kernel reports that the disk (dkb0 in SRM lingo) is in mdma2 mode. > I also read that UDMA is out of question.
I may be completely wrong, but I *think* (dark dark memories) that there
was a DMA bug which was fixed somewhere in 2.5.x or 2.6.x times. So
please try once to disable DMA access entirely, then try to upgrade to
2.6.x :)
MfG, JBG
--
Jan-Benedict Glaw [EMAIL PROTECTED] . +49-172-7608481
"Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg
fuer einen Freien Staat voll Freier B�rger" | im Internet! | im Irak!
ret = do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TCPA));
signature.asc
Description: Digital signature
