Yup, your probably running up against the limitations of 32-bit kernel addressability. We are currently very conservative in this environment, and so tend to end up with a small cache as a result. It may be possible to tweak things to get larger cache sizes, but you run the risk of starving out other processes trying to get memory.
-Mark Robert Milkowski wrote:
Hello zfs-discuss, Simple test 'ptime find /zfs/filesystem >/dev/null' with 2GB RAM. After second, third, etc. time still it reads a lot from disks while find is running (atime is off). on x64 (Opteron) it doesn't. I guess it's due to 512MB heap limit in kernel for its cache. ::memstat shows 469MB for kernel and 1524MB on freelist. Is there anything could be done? I guess not but perhaps.... ps. of course there're a lot of files like ~150K.
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