On Mar 9, 2010, at 1:42 PM, Roch Bourbonnais
<roch.bourbonn...@sun.com> wrote:
I think This is highlighting that there is extra CPU requirement to
manage small blocks in ZFS.
The table would probably turn over if you go to 16K zfs records and
16K reads/writes form the application.
Next step for you is to figure how much reads/writes IOPS do you
expect to take in the real workloads and whether or not the
filesystem portion
will represent a significant drain of CPU resource.
I think it highlights more the problem of ARC vs ramdisk, or
specifically ZFS on ramdisk while ARC is fighting with ramdisk for
memory.
It is a wonder it didn't deadlock.
If I were to put a ZFS file system on a ramdisk, I would limit the
size of the ramdisk and ARC so both, plus the kernel fit nicely in
memory with room to spare for user apps.
-Ross
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