cache and buffer usage with kernel 2.6.10

From: M Benz (mbenz74_at_hotmail.com)
Date: 12/27/04

  • Next message: Steven Rostedt: "Re: Real-time rw-locks (Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15)" 
    To: linux-kernel@vger.kernel.org
Date:	Mon, 27 Dec 2004 16:33:41 +0000

    Hello,

    I just upgrade my linux box from 2.6.8.1 to 2.6.10 yesterday, and I found
    that the memory usage behavier is very different btw the 2 kernels. I built
    2.6.10 with the same .config with my 2.6.8.1

    My box is a Pentium 4 HT machine, with 2GB of RAM, it's running apache to
    service a very busy website, around 1.5M PHP pageviews per day.

    With kernel 2.6.8.1, "top" always show me acount 150MB buffer, 1.3-1.5GB
    cached, and 1-2M free, after switch to kernel 2.6.10, "top" shows me
    around 500MB buffer, 800M cache, and several MB free. after around 10 hours
    with 2.6.10, top now shows me 800MB buffer, 500MB cache and 2-300MB free.

    Is there any change with memory management btw the two kernels? Also, what
    is the different btw "cache" and "buffer"? Why don't kernel 2.6.10 use all
    the memory but leave around 200MB free?

    Thanks.

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  • Next message: Steven Rostedt: "Re: Real-time rw-locks (Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.32-15)"

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