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I've tried searching, and asked on general lists, but so far without result, so I'd like to ask here to find out what causes the issue: I have a notebook (HP Omnibook 6000, but same happens with others) running Linux 2.4.18 and pcmcia-cs 3.2.0. When I make backups to PCMCIA devices, whether hard drives (standard PC-card hard drive) or tapes (SCSI tape attached to Adaptec PC-card), system response drops through the floor -- we're talking seconds to respond to a mouse movement. With the tape drive, this is constant; with the disk, the buffer cache fills up, then the kernel starts writing to the disk and the rest of the system crawls until the writes stop and the next batch of reads happens. Another thing that surprises me is that this runs the CPU at full stretch, since the fan comes on. I find it hard to believe that writing to a rather slow tape drive can fully exercise a 1GHz processor continuously. (It may be relevant for the tape that scsi dis/reconnect is disabled, as it doesn't work for my card.) Is there something I can do about this? I tried the kernel preemption patch and the lock-breaking patch, with no result. (With the disk, I have set the interrupt unmask via hdparm, but this also makes no difference.) I will follow the list, but would appreciate being cc'ed on any replies. Thanks for any advice! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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