From: Maglinger, Paul (PMAGLINGER@scvl.com)
Date: Fri Dec 13 2002 - 12:00:06 EST
Been getting a lot of requests for this, so I'm sending to the list. We
went ahead and recompiled the kernel (had to after making other
configuration changes). We ended up putting the UBC settings back to
default and are looking at other settings.
dbx -k /vmunix
(dbx) pd ufs_getapage_stats
(read_hits / read_looks) * 100 = UBC hit rate
"Maglinger, Paul" <PMAGLINGER@scvl.com> wrote:
>We are trying to do some system tuning on our ES40 cluster running Tru64
>5.1a. One of the recommendations was to calculate the unified buffer cache
>hit rate and adjust the ubc_minpercent value. Originally our calculations
>showed a hit rate of 49.8%, after adjusting the ubc_minpercent the
>read_looks and the read_hits now equal zero. Checking the getblk_hits and
>getblk_misses are both zero on one node and 1020 and 1026 respectively on
>the other node.
>
>We changed the values using the kernel tuner gui on both nodes and
restarted
>the cluster. Do these values look valid? Should we have recompiled the
>kernel after making these changes?
>
>
>Paul Maglinger, A+, CA, CCA, CET, MCSE
>Systems Administrator Shoe Carnival Inc. (812)867-4674 pmaglinger@scvl.com
>
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