XFS/Reiser awful performance

PiotrBanasik · n00b Joined: 26 Aug 2004 Posts: 8 Location: Burnaby, BC

On 2 seperate boxes I've had god awful performance with XFS and Raisser ..
during/just after I/O operations the system momentarily freezes .. this also causes the system time to lose ticks .. so just as an example .. my system clock is behind ~15 min from yesterday (kernel clock .. hwclock works fine) ..

whats in common between the systems is that they're both Athlon XP boxes with nForce chipsets ..

Does anyone have any experience with this problem?

(just as an example how bad this is .. when emerging a kernel for example (with nice -n 20 no less) .. my system is unusable because it locks up for a couple of seconds at a time every 5/10 minutes

lwithers · Guru Joined: 31 Dec 2003 Posts: 300 Location: Reading, UK

Is DMA enabled on the hard drives? To find out, run "hdparm -i /dev/hda" (or whatever the disk is) and look for the mode lines. There are a few types of mode: PIO (programmed I/O) is bad, UDMA is good. An asterisk appears next to the mode that is currently in use.

Plastic · l33t Joined: 24 Mar 2004 Posts: 649

You using a recent kernel version? Got DMA enabled? Filesystems would have nothing to do with /that/ kind of performance.

PiotrBanasik · n00b Joined: 26 Aug 2004 Posts: 8 Location: Burnaby, BC

*doh*

I had this fixed before too and I forgot .. argh

yes .. I didnt have the nforce support built into the kernel .. and that causes an awfull performance mess ..

'ts all good now .. thanks for .. er .. reminding me of the fix =)