lkml.org 
[lkml]   [2007]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: usb-storage nice value
        Hi Alan :)

    * Alan Cox <alan@lxorguk.ukuu.org.uk> dixit:
    > > My system is a bit modest: a 7 years old motheboard with VIA686B, a
    > > 1900+ Athlon XP, but with plenty of RAM (1280MB + 1GB swap). I know, if
    > > I want more hard disk performance I should buy a new box with SATA or
    > > whatever, but the fact is that I hadn't problems with the same hardware
    > > and kernel 2.4.x. I need 2.6.x, so I cannot go back to 2.4.x.
    >
    > Disk is actually less likely to be a problem than PCI bus bandwidth - the
    > older VIA boards seem quite happy to fill the PCI bus solid during bursts
    > of disk I/O

    I was supposing something in that line, since disk speed is quite
    high (when I only read or write but not both). I just didn't think about
    PCI bandwidth.

    > > bad idea too, where should I look for culprits so I can tweak the system
    > > a bit and improve disk performance? I'm not 100% sure that the problem
    >
    > You might want to try the reverse if you have a UDMA100 or UDMA133 drive
    > then setting the speed down to UDMA66 definitely evens out the behaviour
    > of VIA boards when doing video capture. I don't know if it helps playback.

    Won't that reduce disk performance when using just one disk? I don't
    pass much data between disks (or even copy data within one disk), so not
    being able to watch movies while copying data is, for me, more
    acceptable than having a slower disk all the time.

    And yes, all my disks are UDMA100.

    Is there a way of changing chipset behaviour from userspace so PCI
    bus is not filled during IO bursts?

    Thanks a lot for your answer, Alan :)

    Raúl Núñez de Arenas Coronado

    --
    Linux Registered User 88736 | http://www.dervishd.net
    It's my PC and I'll cry if I want to... RAmen!
    -
    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/

    \
     
     \ /
      Last update: 2007-05-17 12:35    [W:4.156 / U:0.596 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site