On Tue, 19 Dec 2000, Andrea Arcangeli wrote:
> On Tue, Dec 19, 2000 at 12:16:03PM +0100, Holger Kiehl wrote:
> > Does it also include the raid1 readbalance patch from Mika?
>
> it seems raid code in 2.2.18aa2 does rebalancing during reads in raid1:
>
>
> Of course you can't do rebalancing during writes.
>
> Is Mika's patch more advanced than the above?
>
Oops, sorry I am not kernel guru to say if that is the case. I only
know that Ingo Molnar once sayed that this (Mikas) patch did go into
the 2.4.0-test series. But it never did go into the 2.2.x series.
Mika Kuoppala's patch is at http://www.icon.fi/~mak/raid1/
> > And why is the 'shared' value of free or /proc/meminfo always 0. Under
> > plain 2.2.18 this is not the case. I saw this under aa1 and aa2.
>
> And you will see this under 2.4.0 too ;). It will avoid to lose clock ticks and
> latency loss while reading /proc/meminfo if you have some good ram (starting
> from 256M). On a 9G alpha machine xosview rended the machine kind of unusable
> due such evil O(N) loop ;).
>
Thanks, I was a bit worried about the zero.
Holger
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