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    SubjectRe: Linux 2.6.30-rc8 [also: VIA Support]
    Date
    On Fri June 5 2009, Harald Welte wrote:
    > On Thu, Jun 04, 2009 at 12:27:07PM -0500, Michael S. Zick wrote:
    > > On Thu June 4 2009, Linus Torvalds wrote:
    > > >
    > > > Side note: is it more stable if you disable the VIA speedstep thing
    > > > (whatever it's called (ok, google tells me it's called "TwinTurbo" and
    > > > "Advanced PowerSaver")?
    > > >
    > >
    > > The e_powersave code.
    >
    > that is only for the early C7, as I've been told by Centaur. C7-M should
    > definitely support the ACPI states. So better to disable both.
    >
    > > It was a fixed-speed kernel build that first hit the 4 hour up-time mark.
    > > I just reposted that build today (the -09143lk).
    >
    > did you actually check if the power transitions are on longer happening?
    >

    No - without a /sys...cpufreq directory I don't know how to do that.
    But the machine is performing exactly as if it was at a fixed speed of 600Mhz.

    Much different than when e_powersaver is included - -

    Also, the e_powersaver stats look reasonable when compared with test loads
    running, so although this may be an acpi controlled system, e_powersaver
    "thinks" it has control (and does make a difference in performance).
    It is not that hard to tell subjectively the difference between 0.4Ghz
    and 1.2Ghz.

    Mike
    > > For want of a documented JTAG port...
    >
    > there is JTAG on the CPU, but only for EXTEST/INTEST, i.e. access to the actual
    > signal lanes for making sure all the BGA pads are soldered and actually connect
    > to the right signals of the next component on the board. There is no embedded
    > ICE or anything of that sort. Also, your board most likely doesn't have JTAG
    > on an accessible connector, since it's out of mass production.
    >




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