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Date: Thu, 30 Sep 2010 09:24:58 +0200
From: Bas Smeelen <b.smeelen@ose.nl>
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Subject: Re: Cache Memory in top command
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On 09/29/2010 07=3A36 PM=2C RW wrote=3A
=3E=3E=3E Bas Smeelen =3Cb=2Esmeelen=40ose=2Enl=3E wrote=3A
=3E=3E=3E
=3E=3E=3E      =20
=3E=3E=3E=3E  *Cache=3A* number of clean pages caching data that are availa=
ble for
=3E=3E=3E=3E immediate reallocation
=3E=3E=3E=3E http=3A//www=2Efreebsd=2Eorg/cgi/man=2Ecgi=3Fquery=3Dtop=26sek=
tion=3D1
=3E=3E=3E=3E    =20
=3E=3E=3E=3E        =20
=3E=3E=3E
=3E I don=27t see why it would be included in wired=2C and I=27m pretty sur=
e
=3E that=27s wrong=2E=20
=3E  =20
>From the man page=3A

*Wired=3A* number of pages wired down=2C including cached file data pages=


=3E The cache queue is a stock of clean pages=2C it=27s sort of an intermed=
iate
=3E state between inactive and free=2E Most memory allocations can be
=3E performed directly from the cache queue=2C which allows memory to hold=

=3E useful data right up to the moment it=27s reallocated=2C and it allows=

=3E FreeBSD to run with very little free =28i=2Ee=2E wasted=29 memory=2E
=3E
=3E Cache memory is topped-up with memory from the inactive queue in the
=3E background=2E Likewise inactive memory is topped-up from active memory=
=2E
=3E Since that=27s done on demand the values are virtually meaningless=2E=
=20
=3E
=3E  =20
Thanks for your detailed explanation


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