Re: Linux-2.4.1-pre11 / ll_rw_b watermark metric?

Petr Vandrovec (VANDROVE@vc.cvut.cz)
Mon, 29 Jan 2001 11:56:13 MET-1


On 29 Jan 01 at 4:43, Dieter Nützel wrote:
> I have pre11 running with Andrea's suggested fix.
>
> high_queued_sectors = total_ram / 3;
> low_queued_sectors = high_queued_sectors / 2;
> if (low_queued_sectors < 0)
> low_queued_sectors = total_ram / 2;
>

I have one question: How it can happen that low_queued_sectors
is less than zero with this changed logic? (And if it get triggered,
low_queued_sectors will be greater than high_queued_sectors - which
is not what we want...)

But it is certainly better than 2.4.0-pre8 approach, as
with 200MB of memory (exactly 192MB left unused) you can end up with
low_queued_sectors == 0... And it does not give you optimal behavior.
Best regards,
Petr Vandrovec
vandrove@vc.cvut.cz

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