Re: Streaming Replication Networking Best Practices?

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От Don Seiler
Тема Re: Streaming Replication Networking Best Practices?
Дата
Msg-id CAHJZqBDPRuJGYNNpHfpMpYnnyOj1XkA7DFziyM5TX9wp30-DfA@mail.gmail.com
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Ответ на Re: Streaming Replication Networking Best Practices?  (Peter Eisentraut <peter.eisentraut@2ndquadrant.com>)
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On Mon, May 14, 2018 at 3:33 PM, Peter Eisentraut <peter.eisentraut@2ndquadrant.com> wrote:
You might find that increasing the TCP receive buffer on the receiving
side will help.

This got me wondering. I know Oracle requires minimums for some kernel settings like net.core.rmem_default and rmem_max and similar for wmem, ie:

  • net.core.rmem_default = 262144
  • net.core.rmem_max = 4194304
  • net.core.wmem_default = 262144
  • net.core.wmem_max = 1048576

Looking at my primary and standby, they look to still be the CentOS defaults for CentOS7 and CentOS6.

Primary (CentOS7)
  • net.core.rmem_default = 212992
  • net.core.rmem_max = 212992
  • net.ipv4.tcp_rmem = 4096        87380   6291456
  • net.core.wmem_default = 212992
  • net.core.wmem_max = 212992
  • net.ipv4.tcp_wmem = 4096        16384   4194304

Standby (CentOS6)
  • net.core.rmem_default = 124928
  • net.core.rmem_max = 124928
  • net.ipv4.tcp_rmem = 4096        87380   4194304
  • net.core.wmem_default = 124928
  • net.core.wmem_max = 124928
  • net.ipv4.tcp_wmem = 4096        16384   4194304
FWIW: these machines are VMWare with 8 cores and over 100GB of memory. I'm assuming we have gigabit ethernet within the datacenter but the circuit between the two is 200 Mbps.
--
Don Seiler
www.seiler.us

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