On Sep 17, 2:03pm, Brad Knowles wrote:
} Subject: Re: More benchmarking stuff...
}
} Sadly, when I go to the second set of tests (20,000 files and
} 50,000 transactions), my performance goes into the crapper. I know
} that softupdates trades memory for speed, and I guess this PPro 200
} w/ 128MB RAM just doesn't have enough memory to keep up.
}
} For this stage, I now get:
}
} Transactions per second: 33
} KBytes Read per second: 79.66
} KBytes Written per second: 144.31
I'd expect a NetApp to do a lot better than UFS on FreeBSD if there are
large directories. Directory lookups in UFS require a sequential scan
whereas the NetApp filesystem uses some sort of hashing scheme.
Also FreeBSD only caches a limited number of directory blocks. This
was discussed on -hackers in April. Search for the subject "Directories
not VMIO cached at all!". Matt Dillon posted a patch to to better
cache directories (at the possible expense of wasted RAM and which breaks
NFS) in Message-ID <[EMAIL PROTECTED]>.
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