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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
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I've had this problem for a while, but now it's really beginning to piss me off. I have two Maxtor hard drives, running Slack 9.1 (2.6.3 kernel). Occasionally, I have a need to transfer large files between hard drives. By large, I mean anything over 300 or 400 MB. Usually I initiate the transfer, and watch some blazing speeds (30 or 40 MB/s) for about 30 seconds, then the transfer rate drops to about 2 or 3 MB/s. My CPU usage is also throttled to 100% the whole time, and the whole system comes to a crawl. I've got an Athlon XP 2500+ with 1 gig Ram, and I'm sure this shouldn't be happening. I'm using ext3 on both drives, DMA is enabled, and here is the hdparm output for both:
I just had a brainstorm while I was typing the original message. This probably has something to do with buffers! At least I hope. I'm a bit nervous experimenting with hdparm, so I'll wait for a reply or two first...
Hmm, I would try moving /dev/hdb to the secondary IDE, '/dev/hdd' and then do a large file transfer. I bet the problem vanishes. Remember that hda/hdb share the same irq and I/F. Handing data back and forth down the same cable slows things down a bit. But that's just a guess on my part. Tuning hdparms might help a bit, but it usually works fine out of the box on current equipment.
P.S. I just remembered something else, do a 'lspci -vv' and make sure dmesg show that you're detecting and using the right drivers for your IDE chipset, aka BX, VIA, etc. You might have to compile a custom kernel to get everything right.
Thanks for the advice. I just read something similar on O'Reilly. I think I need a PCI add-on IDE controller, as my DVD burner is on hdb, and hdc would simply be a slave to its bandwidth. Thanks again...