Re: was there a change in FreeBSD SHM implementation from

>>>>> "CS" == Curt Sampson <cjs(at)cynic(dot)net> writes:

CS> On Thu, 11 Jul 2002, Vivek Khera wrote:
>> Actually performance went down. Way down. I disagree with your
>> argument that increasing the cache will help, since the cache is not
>> needed if you don't pushd out your SHM pages in the first place and
>> need to reload them quickly.

CS> Ah, so your entire working data set can fit into your shared memory? In
CS> that case, yes, you are better off not decreasing it. I guess we should
CS> add a note to the FAQ for people using very small databases....

Sometimes it does, sometimes it does not. But I still disagree that
relying on the OS to cache pages that you could (and should) just as
well keep in the SHM segments already makes no sense.

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Vivek Khera, Ph.D. Khera Communications, Inc.
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