Date: Fri, 06 Apr 2012 10:45:08 +0400 From: Andrey Zonov <andrey@zonov.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: alc@freebsd.org, freebsd-hackers@freebsd.org, Alan Cox <alc@rice.edu> Subject: Re: problems with mmap() and disk caching Message-ID: <4F7E90F4.9050107@zonov.org> In-Reply-To: <4F7DF88D.2050907@zonov.org> References: <4F7B495D.3010402@zonov.org> <20120404071746.GJ2358@deviant.kiev.zoral.com.ua> <4F7DC037.9060803@rice.edu> <4F7DF39A.3000500@zonov.org> <20120405194122.GC2358@deviant.kiev.zoral.com.ua> <4F7DF88D.2050907@zonov.org>
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On 05.04.2012 23:54, Andrey Zonov wrote: > On 05.04.2012 23:41, Konstantin Belousov wrote: >> You do use UFS, right ? > > Yes. > I've run test on ZFS. Mem: 2645M Active, 363M Inact, 2042M Wired, 1406M Buf, 42G Free $ ./mmap /mnt/random Mem: 3669M Active, 363M Inact, 3067M Wired, 1406M Buf, 40G Free It eats 2Gb as I understand. # umount /mnt # zfs mount -a Mem: 2645M Active, 363M Inact, 2042M Wired, 1406M Buf, 42G Free $ cat /mnt/random > /dev/null Mem: 2645M Active, 363M Inact, 3067M Wired, 1406M Buf, 41G Free That's correct - 1Gb. About "Buf" memory. Is this reasonable to set it to 10% of physical memory? I've lost 10Gb by default on machines with 96Gb. -- Andrey Zonov
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