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Erik Mouw wrote: >On Tue, Aug 23, 2005 at 04:38:36PM +0530, Rajesh wrote: > > >>I have a case occasionally when I copy data from a usb storage (ipod) to >>my hard drive the load average goes up from 0.4 to about 15.0, and the >>system becomes very unusable till I kill the cp command. I have checked >>the CPU usage, bytes read from usb device, byte written to hard drive >>etc, and all these values are low like CPU usage is at a maximum of 30%, >>disk read bytes is at an average of 1.5 MiB/s, disk write bytes is at >>1.5 MiB/s, number of processes is at 110, etc, during this high load. >> >> > >1.5 MB/s suggests you're using an IDE drive in PIO mode. Switch to DMA >mode (hdparm -d 1 /dev/hda) and see if it gets any better. > > > It seems to have helped a little. Now the rate at which load average goes up has decreased ( I can copy up to about 700-800 MiB compared to a high of 200MiB earlier), but it is still going up to 15 gradually at which point I am still killing the cp process to make the system usable. I know I am not giving much information. But if I know what factors cause the loadavg to keep on going up I will gladly provide it. I am running 2.6.12 kernel on a laptop. I have an ipod attached to my USB 1.1 as a drive on which I am saving and retreiving large files(2-4GiB files). The transfer speed is slow, but I am fine with it, as long as the load average stays within bounds so that the machine is usable. (If I dual boot to windows and do the same operation, I am able to get the files copied over in a few minutes.). Can vfat be a factor? Thanks Rajesh >Erik > > > - 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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