Re: udpated data logging available

[Manuel Krause <manuelkrause@netscape.net>]

On 06/26/2003 01:42 PM, Dieter Nützel wrote:
> Am Donnerstag, 26. Juni 2003 03:47 schrieb Chris Mason:
> 
>>On Wed, 2003-06-25 at 20:16, Christian Mayrhuber wrote:
>>
>>>Am Mittwoch, 25. Juni 2003 21:15 schrieb Chris Mason:
>>>
>>>>Thanks for giving things a try.  I just uploaded io-stalls-7.diff,
>>>>which should do better at fixing latency during heavy io.
>>>>
>>>>-chris
>>>
>>>My feeling is that io-stalls-6 is where standard 2.4.21 was if it comes
>>>down to latency. But io-stalls-7 makes a big improvement for me during
>>>heavy io. The directory listing in Konqueror, including image preview,
>>>appears nearly immedeately even during heavy io.
>>
>>Great to hear, thanks for giving it a try.  io-stalls-6 helped most when
>>you've got multiple devices and a streaming write to one was slowing
>>down all the others.  -7 added in a tweaked form of Andrea's elevator
>>latency fixes, and they make a big difference when there's a lot of
>>writes to the drive you're trying to read from.
> 
> So, does it apply to 2.4.21-aa1 (latest is 2.4.21rc8aa1) cleanly? ;-)
> 
> Setting HZ=1000 (from 100) in linux/include/asm/param.h give me very 
> impressive latency boost. 2.4.21-rc1-jam1 (-rc1aa1)

Just tried this HZ=1000 setting, too.

(With the following patches "only": data-logging, search_reada-4 and
rml-preempt on 2.4.21-final, and AA.00_nanosleep-6.diff (THAT ONE
decreased my VMware+system CPU idle usage in these circumstances by
approx. 1/2 [from 25% to approx. 12.5%] ).

I don't get any performance boost with it -- but some finer distribution
of "requests"  like from disk i/o, screen interaction
(XF86-4.3.0-SuSE-8.0) and running applications' progress together with
high mem/disk load (the result is my word for "finer granularity" in
computer usage). That setting feels much better than normal (HZ=100).

Would I face problems, though?! Why isn't that setting standard ?

> Would you have some latencytest0.42-png numbers?
> 
> But ACPI will not shut down my SMP system (same with HZ=100) most of the time. 
> I had it accidentally set to HZ=1024 and it power down all the time...;-)
> 
>>Hopefully we'll be able to hash out something suitable for 2.4.22-pre.
> 
> 2.4.22-pre1 is out form some days...
> 
> Regards,
>   Dieter

Thanks,

 Manuel

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