IBM definitely seems to be suggesting that for AIX and Linux setups running at 1 or 10 gig.
https://www.ibm.com/support/knowledgecenter/ssw_aix_72/performance/tcp_streaming_workload_tuning.html
https://www.ibm.com/support/knowledgecenter/ssw_aix_72/performance/tcp_streaming_workload_tuning.html
On Tue, 2020-02-11 at 21:19 +0000, Steinmetz, Paul via MIDRANGE-L wrote:
Back in 2005, IBM suggested we change from default of 8k to 64k for both.
Should we consider increasing these to 262k?
Paul
-----Original Message-----
From: MIDRANGE-L <
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On Behalf Of Rob Berendt
Sent: Tuesday, February 11, 2020 3:59 PM
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Subject: CHGTCPA TCPRCVBUF(262144) TCPSNDBUF(262144)
On our performance audit it was noted that <snip> The tcp/ip buffers (TCPRCVBUF/TCPSNDBUF) are set to 262k. This is large for send/receive buffers. The general recommendation is 64K. If the network card is not able to accommodate this size, then it will reduce automatically to its highest capable size.
</snip>
I do have these set
TCP receive buffer size . . . . TCPRCVBUF > 262144
TCP send buffer size . . . . . . TCPSNDBUF > 262144
I'll be danged if I can remember why I have those set to that number. I've really got to start documenting these kind of changes...
Can anyone guess why I have it set to that size?
Rob Berendt
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