Re: Very low disk performance on 5.x

From: Andrey Smagin (samspeedu_at_mail.ru)
Date: 05/03/05

  • Next message: Arne : "Re: Very low disk performance on 5.x" 
    Date: Tue, 3 May 2005 11:43:55 +0400
To: freebsd-performance@freebsd.org

    Hi ALL,

          I not sure that it only low disk performance, but.
    When i copying /usr/src tree from file server (AMD K6-2 225) to my Duron
    1133(1GB RAM), speed is about 3-4MBytes/s. But played music on my PC is some
    gappy. Also removing /usr/ports tree have same much effect for music. I set
    large buffers in all avaliable players(mpg123, mpg321, mplayer, xine, xmms)
    on my system (FBSD6.0-current 1 may 05), but it don't have effect.
    I think that somthing lock IRQ from sound card(SBLive emu10k1 classic FBSD
    driver :) ) or call of SB buffer fill. How to diagnose what uninterruptable
    process(or in system function) can to lock CPU for so much time
    (1 sound buffer - 4096 bytes 4096/176400=~23ms) ? And, please, help me with
    tuning of sound performance. I think it depend from disk issues. 

    -- 
Best regards,
 Andrey                            mailto:samspeedu@mail.ru
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