Thanks Greg and others for your replies, > This is really something to watch out for. One quick thing first > though: what frequency does the CPU on the new server show when you > look at /proc/cpuinfo? If you see "cpu MHz: 1000.00" It was like that in the initial setup --- I just disabled the cpuspeed service (service cpuspeed stop; chkconfig cpuspeed off ), and now it shows the full 2600MHz at all times (the installation of PG was done after this change) > Another really handy way to gauge memory speed on Linux, if there are > similar kernels installed on each system like your case, is to use > "hdparm -T". Great tip! I was familiar with the -T switch, but was not clear on the notion that the figure tells you that much about the overall memory performance! Anyway, I checked on both, and the new system is slightly superior (around 2200 for the new, around 1900 for the old one) --- a bit below the figure you mention you'd expect (2500 --- though that was for a 2.8GHz Opteron, presumably with faster FSB and faster memory??) I guess my logical next step is what was suggested by Scott --- install 8.2.4 and repeat the same tests with this one; that should give me interesting information. Anyway, if I find something interesting or puzzling, I would post again with the results of those tests. Thanks again for the valuable advice and comments! Carlos -- -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
