Re: Kernel 2.4.x and 2.4.1-preX - Higher latency then 2.2.x kernels?

Chris Mason
2001-01-21T18:05:05Z

On Saturday, January 20, 2001 02:59:24 PM -0500 Gregory Maxwell
<greg@linuxpower.cx> wrote:

> On Sat, Jan 20, 2001 at 02:50:16PM -0500, Shawn Starr wrote:
>> It just seems that since using 2.4 ive noticed my poor Pentium 200Mhz
>> slow down whether being in X or otherwise. It just seems that the system
>> is sluggish.
>>
>> I am using the new ReiserFS filesystem and I do know its still in heavy
>> development perhaps my latency is due to this (?)
>
> Reiserfs uses much more complex data structures then ext2 (trees..). I
> don't think that latency has ever been a design criteria and all of the
> benchmarks they use are pretty much pure throughput tests.
>
> So it wouldn't be really surprising if reiserfs had very bad latency. You
> should apply the timepegs patch and profile your kernel latency to see
> where it's coming from.

I'm actually very interested in fixing any latency problems. If you do
these tests, please send the results along.

-chris