lkml.org 
[lkml]   [2008]   [Dec]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [patch] Performance Counters for Linux, v2

    * David Miller <davem@davemloft.net> wrote:

    > From: Ingo Molnar <mingo@elte.hu>
    > Date: Tue, 9 Dec 2008 12:02:46 +0100
    >
    > >
    > > * stephane eranian <eranian@googlemail.com> wrote:
    > >
    > > > > There's also more generic x86 support: all 4 generic PMCs of Nehalem
    > > > > / Core i7 are supported - i've run 4 instances of KernelTop and they
    > > > > used up four separate PMCs.
    > > >
    > > > Core/Atom have 5 counters, Nehalem has 7. Why are you not using all of
    > > > them already?
    > >
    > > no, Nehalem has 4 generic purpose PMCs and 3 fixed-purpose PMCs (7
    > > total),
    > ...
    > > Saying that it has 7 is misleading.
    >
    > Even you just did.

    which portion of my point stressing the general purpose attribute was
    unclear to you?

    Saying it has 7 is misleading in the same way as if i told you now:
    "look, i have four eyes!". (they are: left eye looking right, left eye
    looking left, right eye looking left and right eye looking right)

    Nehalem has 4 general purpose PMCs, not 7. Yes, it has 7 counters but
    they are not all general purpose. The P4 has 18.

    Ingo


    \
     
     \ /
      Last update: 2008-12-09 12:25    [W:0.021 / U:90.324 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site