On 10 Apr 2001, Paul J Collins wrote:
> To rephrase for the hard of thinking: do selective acknowledgements
> improve network performance/throughput with a cost in terms of time
> spent in the kernel doing the SACK-related calculations?
off the cuff:
with SACK disabled the kernel will presumably ACK every incoming TCP
packet rather than gathering ACKs.. lot more work.
so i think that tuning page is a bit bogus, afaik only reason to
disable SACK and timestamps is for interoperability with broken IP
also, his VM tuning stuff: those numbers are highly specific to the
amount of RAM installed and workload... the kernel picks sensible
numbers by default on boot. if you're going to change them you need to
tune for your specific machine - not just pick numbers from a webpage.
disabling atime: can potentially break stuff.
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