Tuning upstream keepalive parameter

[CJ Ess]

So I'm looking for some advice on determining an appropriate number for the
keepalive parameter within an upstream stanza.

They server processes ~3000 requests per second, and haproxy is the single
upstream destination. Dividing by the request rate by the number of
processors (workers) I'm thinking that maybe 256 is a good starting number
for the max keepalives.

Is that realistic? Or should I be looking at a fraction of that number?
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