Date: Tue, 17 Apr 2007 13:13:23 -0700 (PDT) From: Joerg t <tjoerg@yahoo.com> To: Robert Watson <rwatson@FreeBSD.org>, Maxim Sobolev <sobomax@FreeBSD.org> Cc: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com>, freebsd-current@FreeBSD.org, pjd@FreeBSD.org Subject: Re: Some comments on ZFS Message-ID: <627853.32405.bm@rrr2.mail.re1.yahoo.com>
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>> The "vmstat -m" will give you precise breakdown of kernel memory usage. > You'll also want to use "vmstat -z". "-m" captures memory allocated by > kernel malloc(9), which is used for variable-sized objects, or objects that > are irregularly allocated. "-z" captures memory allocated by the kernel zone > allocator, used for regularly sized and frequently allocated objects. Small > allocations in malloc(9) are actually allocated via fixed size memory buckets > in the zone allocator, so if looking at "-m" as well, ignore zones who's names > consist solely of a number (i.e., "16", which is the 16-byte bucket). > Robert N M Watson > Computer Laboratory > University of Cambridge In the same P4 HT / 1GB box : # zpool create tank # zfs set atime=off tank # zfs create tank/src # zfs create tank/obj # zfs set mountpoint=/usr/src tank/src # zfs set mountpoint=/usr/obj tank/obj # vmstat -m | grep solaris solaris 581 2526K - 13465 16,32,64,128,256,512,1024,2048,4096 # vmstat -z arc_buf_hdr_t: 128, 0, 56, 64, 121, 0 arc_buf_t: 20, 0, 54, 284, 157, 0 zil_lwb_cache: 176, 0, 0, 0, 0, 0 zfs_znode_cache: 236, 0, 3, 45, 13, 0 # cd /mnt; tar -cf - . | (cd /usr/src; tar -xvf -) # vmstat -m | grep solaris solaris 71293 68045K - 3896726 16,32,64,128,256,512,1024,2048,4096 # vmstat -z arc_buf_hdr_t: 128, 0, 5813, 4927, 117549, 0 arc_buf_t: 20, 0, 5273, 4867, 117746, 0 zil_lwb_cache: 176, 0, 1, 109, 206, 0 zfs_znode_cache: 236, 0, 16616, 3896, 42226, 0 # cd /usr/src; make buildworld # vmstat -m | grep solaris solaris 117656 66398K - 104447388 16,32,64,128,256,512,1024,2048,4096 # vmstat -z arc_buf_hdr_t: 128, 0, 5172, 6018, 247834, 0 arc_buf_t: 20, 0, 2051, 8089, 281300, 0 zil_lwb_cache: 176, 0, 2, 174, 686, 0 zfs_znode_cache: 236, 0, 33809, 1023, 87030, 0 thanks. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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