Re: 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.)

Andrew Morton
2004-05-16T10:02:17Z

Steven Cole <elenstev@mesatop.com> wrote:
>
> The script only reported one
> iteration finished, while I got it to do 36 iterations over several hours earlier
> today (with a 2.6.3-4mdk vendor kernel), so I'm going to add some timing
> tests to the script to see if things are really slowing down with current kernels,
> or if it's just my worried imaginings.

I did a bit of testing on a 256MB laptop with a fairly slow disk, ext3.
Three iterations of the test took:

2.6.6: 1055.53s user 327.14s system 32% cpu 1:10:06.71 total

2.4.27-pre2: 1042.03s user 307.21s system 32% cpu 1:09:46.00 total

2.6.3: 1053.23s user 326.16s system 27% cpu 1:22:07.24 total

So there's nothing particularly wild there. It's possible I guess that the
2.6 VM is very sucky but something else made up for it - possibly the
anticipatory scheduler but more likely the Orlov allocator.

You're using reiserfs, yes?

Are you sure the IDE disks are in DMA mode?