Re: polling in 4.11 vs 5.4

From: dima (_pppp_at_mail.ru)
Date: 08/23/05

  • Next message: Matthew Grooms: "odd tcpdump output w/ 6.0-BETA2 ..." 
    To: Mao Shou Yan <david.mao@thomson.net>
Date: Tue, 23 Aug 2005 15:26:27 +0400

    > I hope this is the right place that I post to!
    >
    >
    >
    > When I enabled polling in 5.4 and 4.11, I found that CPU load
    > in 5.4 is much higher than 4.11. For example, suppose HZ is 5000, in 5.4
    > the idle CPU is about 87%, but in 4.11, the idle CPU is about 99.9%. Is
    > this right? Or the statistic is wrong in 4.11?
    >
    > BTW, ACPI is disabled under 5.4.
    >
    > BTW, I found that context switch in 5.4 is much higher than 5.4 while
    > enabling polling. (Using systat -vmstat 1)
    >
    > I'm looking forward your reply.
    The polling code hasn't been changed since 4.11. I've posted a patch to resolve giant lock issue in it, but it wasn't merged. I don't have enough time by now to rewrite it according the opinions mentioned. But the cost of context switch is definitely higher on 5.x
    HZ == 5000 is too much i think. 1000 is quite enough for network-intensive applications.

    >
    > Any response is welcome!

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