Messages in this thread |  | | From | Terje Malmedal <> | Subject | Re: USB 2.0 with 250Gb disk and insane loads | Date | Tue, 3 Jun 2003 13:49:26 +0200 |
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[Alexander Hoogerhuis] > Stuck it in an older machine on USB 1.1 and it foudn the disk fine > (redhat 9, 2.4.20-13.9 kernel on that machine), and ditto result:
> 19:15:16 up 2 days, 20:23, 4 users, load average: 6.02, 2.41, 0.89 > 58 processes: 55 sleeping, 3 running, 0 zombie, 0 stopped > CPU states: 0.2% user 4.0% system 0.0% nice 0.0% iowait 95.8% idle > Mem: 385040k av, 380820k used, 4220k free, 0k shrd, 67368k buff > 224720k active, 69412k inactive > Swap: 521632k av, 80k used, 521552k free 237452k cached
> and generating about 2500 interrupts for the usb controller per 10 > seconds and when i finally break it off and give it "sync" it uses > about two minutes with about 4500 per 10 seconds to get it all on > disk. On 2.4 the machine becomes more and more sluggish if I let it > go more than a short minute.
I had the same problem with USB 1.1. I solved it by writing a LD_PRELOAD-able shared library which overrides write() to do a fdatasync() on the filehandle after a megabyte worth of writes.
Would be nice to have it fixed in the kernel though.
-- - Terje malmedal@usit.uio.no - 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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