OK Scott. I go to change this kernel parameter and will repeat the tests. Tanks!
El 3 de abril de 2012 17:34, Scott Marlowe <scott.marl...@gmail.com>escribió: > On Tue, Apr 3, 2012 at 9:32 AM, Scott Marlowe <scott.marl...@gmail.com> > wrote: > > On Tue, Apr 3, 2012 at 6:20 AM, Cesar Martin <cmart...@gmail.com> wrote: > >> Hello there, > >> > >> I am having performance problem with new DELL server. Actually I have > this > >> two servers > >> > >> Server A (old - production) > >> ----------------- > >> 2xCPU Six-Core AMD Opteron 2439 SE > >> 64GB RAM > >> Raid controller Perc6 512MB cache NV > >> - 2 HD 146GB SAS 15Krpm RAID1 (SO Centos 5.4 y pg_xlog) (XFS no > barriers) > >> - 6 HD 300GB SAS 15Krpm RAID10 (DB Postgres 8.3.9) (XFS no barriers) > >> > >> Server B (new) > >> ------------------ > >> 2xCPU 16 Core AMD Opteron 6282 SE > >> 64GB RAM > >> Raid controller H700 1GB cache NV > >> - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (SO Centos 6.2) > >> - 4HD 146GB SAS 15Krpm RAID10 stripe 16k XFS (pg_xlog) (ext4 bs 4096, > no > >> barriers) > >> Raid controller H800 1GB cache nv > >> - MD1200 12HD 300GB SAS 15Krpm RAID10 stripe 256k (DB Postgres 8.3.18) > >> (ext4 bs 4096, stride 64, stripe-width 384, no barriers) > >> > >> Postgres DB is the same in both servers. This DB has 170GB size with > some > >> tables partitioned by date with a trigger. In both shared_buffers, > >> checkpoint_segments... settings are similar because RAM is similar. > >> > >> I supposed that, new server had to be faster than old, because have more > >> disk in RAID10 and two RAID controllers with more cache memory, but > really > >> I'm not obtaining the expected results > > > > What does > > > > sysctl -n vm.zone_reclaim_mode > > > > say? If it says 1, change it to 0: > > > > sysctl -w zone_reclaim_mode=0 > > That should be: > > sysctl -w vm.zone_reclaim_mode=0 > -- César Martín Pérez cmart...@gmail.com
