Fc8 test1 kernel backported to fc7 -- qualitive impressions

Christopher Brown snecklifter at gmail.com
Sun Aug 12 19:48:46 UTC 2007


On 11/08/07, Leslie Satenstein <lsatenstein at videotron.ca> wrote:
>
>  I back ported the fc8 (*23*) kernel to fc7 (64bit) and noted the
> following anomalies.
>

What do you mean by this? You backported fixes, you rebuilt the kernel with
the f8t1 spec or you simply upgraded the kernel only from devel repos...?

When there are few processes running, performance is great.  But, here is
> what I noticed and suffered with.
>
> Start pup. (downloading 12 updates).
> Started firefox and evolution only after pup started to do it's thing.
>
> What I experienced was very very slow startup of both evolution and
> firefox(10 secs), with both the two timing out due to lack of
> responsiveness.  I think that the timeout appears to be due to the pup
> application hogging the cpu.
>

Doubtful. More likely pup is hogging bandwith temporarily. Firefox and
evolution are attempting to pull web and email data and are unable to do so,
thereby slowing things down.

I am guessing that pup has no timeslice max value to tell the process
> dispatcher to move it to the back of the dispatch queue, or the new process
> dispatcher in the *23* kernel doesn't know when it should to give control to
> the other waiting processes.
>

I think you are guessing. If you mean CFS in 23 then you are off the mark.
It certainly knows when to hand-off, that is its job.

I think, by my guessing, that the timeout or response problems are due to
> fc7 applications that were built for the fc7 kernel (*22*), where the
> frequent clock interrupt in the kernel allowed the round robin execution to
> occur equitably.  I am surmising, probably very incorrectly, that the new
> kernel needs a new process dispatch algorithm which includes a max timeslice
> value for that process group. It could be there, but the fc7 applications
> were not built to communicate that way to the kernel's process dispatcher.
>

Please don't say things like this - its just nonsense. Better not to post to
the list at all.

As I indicated, my observations are qualitative. I can't substantiate
> anything, so I may be completely wrong.
>

Then why post?

My environment:  Fc7 64 bit version, home use, 1 gig ddr2 memory, dual core
> processor (intel d930 -- 3gig hertz). Dual disks (one disk exclusive for
> 32bit fc7, the other exclusive for 64bit fc7).
>
> Do I like Fedora?  You answer that question.
>

Eh? I'm really lost now.

Chris

-- 
http://www.chruz.com
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