Re: Custom Kernel Networking support
On Thu, 02 Feb 2012 13:17:24 -0500, A E [Gmail] wrote:
> On Thu, Feb 2, 2012 at 12:37 PM, Camaleón <noelamac@gmail.com> wrote:
(...)
>> OTOH, I've always thought that lower values for timer frequencies are
>> better for servers...
>
> a faster timer interrupt, as a I understand, allows for a more precise
> and granular track of time and how events are scheduled handled.
(...)
Yes, which can be good for multimedia purposes but not for the usual
server stuff.
> In other words, there is no single value for the timer frequency which
> works for all users.
I have no complaints and all of my systems (servers, workstations and
netbooks) have the default setting :-)
> Changing the frequency is still relatively hard, however; some people
> are more comfortable with building new kernels than others. Wouldn't it
> be nice if the frequency could be made into a boot-time parameter, so
> that it could be changed from one boot to the next without a kernel
> rebuild? "
Yup. There are linux distributions that provide precompiled kernels with
these settings "tweaked" so the users can install the best kernel for
their needs. openSUSE does this way, for instance.
> I have noticed a big difference between 1000HZ and 100HZ on a system
> running in VMware. The clock will often end up being much slower than
> the real time clock just because VMware can't deal with the overhead
> (100HZ being the fix). "
Sure, the change can be noticeable in some conditions or specific
environments.
>> Anyway, do the cards came up when no bonding is set or it fails in the
>> same way?
>>
>>
> Yes, fails the same way with or without bonding.
Mmm, I don't see a direct relation between this setting and the
networking stack :-?
(...)
>>> Can anyone see what is making it fail? Note, I have ONLY changed the
>>> Timer Frequency and nothing else
>>
>> Nope, sorry, I can't decipher what can be wrong. But sometimes you need
>> to use the menuconfig instead manually making the changes because some
>> kernel menus/options require another modules to be enabled.
>>
>>
> Not modifying anything by hand, all being done in menuconfig. I did the
> following:
>
> # cp -p /boot/config-2.6.32-5-sparc64 .config # make menuconfig
> <Changed the Timer Frequency from 250Hz to 1000Hz> <Exit><Exit>
> # diff .config.old .config (The output of which is pasted above)
>
> and then saw ALL those changes that got made on its own by simply
> changing the Timer Frequency.
>
> Weird!
Yes... I've never heard about that before. I wonder if the architecture
(being a kernel compiled for sparc64) can make a difference here :-?
Greetings,
--
Camaleón
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