Re: [linuxsh-dev] Re: memcpy/TLBMiss patch assembled for 2.4.18cvs

[Masahiro A. <m-...@aa...>]

On Wed, 29 Jan 2003 11:35:32 +0900
Masahiro Abe <m-...@aa...> wrote:

> I still haven't being able to make TLB-Miss handling speed-up part work on
> my SolutionEngine.
> I must do something else right now so my investigation pends now. I
> really appreciate if anyone can help on this. If anyone can give more
> info/suggestion/patch, I'll try that.

Since then, Stuart let me see his entire source tree, and some missing
parts are found.  Now it seems to be working with those changes.

Also, SUGIOKA-san generously gave me his version of modification. I also
tried that and it seems to be working fine.

I'm not sure which is better, so I've assembled two version of patches
for TLB Miss speede-up and put in:
<ftp://ftp.aandd.co.jp/pub/linuxsh/work/20030308/>

There are 5 patches there.

1. diff-2.4.18-cvs.diff.bz2 is to apply changes to stock 2.4.18 kernel,
and make it same as the "linux-2_4_18" tagged cvs source.

2. diff-2.4.18cvs-se.diff.bz2 is to apply to the "linux-2_4_18" tagged
cvs source, and make it boot from CompactFlash on SolutionEngine 7750S.
This is not needed for other platforms.

3. diff-2.4.18cvs-memcpy-20030308-1.diff.bz2 is to apply to the
"linux-2_4_18" tagged cvs source, and includes Stuart's "memcpy speed-up"
(with fixes that discussed later on the list)

For "TLB Miss Handling optimization", there are two types:

4. diff-2.4.18cvs-tlb-sm-20030308-1.diff.bz2 includes Mr. Stuart
Menefy's original patch plus some missing parts.

5. diff-2.4.18cvs-tlb-ts-20030308-1.diff.bz2 includes Mr. Toshinobu
Sugioka's modified patch.

I hope these files be tried by many of you and grows to good shape. It
will be good if 4 and 5 be merged to be a definitive implementation for
TLB Miss handling speed-up.
(I can't do that by myself, because I don't understand the exact detail
of those patches. At least for now.)

---
By the way, I've also assembled patches to make RTLinux-3.2-pre1 work
with above kernels. Those are put in:
<ftp://ftp.aandd.co.jp/pub/linuxsh/rtlinux/work/20030327/>
These are not "Real-TIme" yet, though. Timer latency still gets to
~500usec with heavy disk access.

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Masahiro ABE, A&D Co., Ltd. Japan