Re: Kernel 2.2.19 crashes, 2.4.4 bad performance
Hello Thomas,
I am curious about your test.
I am assuming that you built kernel-2.4.4 under 2.2.19 and 2.4.4??
Why did you use -j4 instead of -j2 on a dual processor box??
Best Regards,
--George
On Monday 14 May 2001 08:32, T. Weyergraf wrote:
> Hi all,
>
> triggered by a discussion in irc.openprojects.net, #alphalinux, I've spend
> some time on benchmarking various linux kernels and came across some very
> strange results.
>
> Platform: Dual 667 UP2000, 1.5gig ram, 3 adaptecs with 5 disks total,
> serial console.
>
> Kernel 2.4.4 seems to suffer a *tremendous* performance impact, compared to
> 2.2.19. A 'time make -j4 boot' of the kernel-2.4.4 sources gives the
> following compile-times:
>
> 2.4.4 2.2.19
> real 3m58 2m38
> user 4m23 2m23
> sys 0m14 0m11
>
> Several other tests seem to indicate a similar decrease in performance wrt
> real-time, some of them being CPU and/or memory-bound only.
>
> In addition to that, i've noticed, that kernel 2.2.19 frequently crashes,
> after giving the well-known "stuck spinlock" messages in rather random
> processes. No panics are given, the system just freezes completely ( no
> ping and the like ).
>
> So, obviously, my two questions are:
>
> 1. Has anybody ever observed the performance impact, i'm seeing with kernel
> 2.4.x ? 2. Since i moved to kernel 2.4.x very early for various reasons, I
> would like to know, which of the recent 2.2.x kernels can be considered
> stable on a alpha/SMP platform ( ideally being a UP2000 as well ).
>
> I'm a bit confused here ;-)
>
> Regards,
> Thomas Weyergraf
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