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On Apr 27, 2012, at 11:43 AM, Petar Bogdanovic wrote:
>> You need to increase the TCP window size to take significant advantage
>> of the SSH HPN changes. Take a look at the following sysctls:
>> You'll also need to increase NMBCLUSTERS, unless that has become
>> a sysctl tunable as well...
> Thanks for the hints but I'm not sure I understand the logic behind
> this. HPNDisabled=no is the default setting, and I'm not running high
> powered n Gigabit-Interfaces so why should a default setting in a rather
> unspectacular environment require any additional tweaking?
The defaults are chosen to be reasonable for a wide range of circumstances,
without consuming a lot of network buffer memory. If you have a high-speed
link and want to improve performance, then the default values are not ideal.
(Note that these values date back to when 10Mbs ethernet was "fast", so even a
gigabit link could be improved by tuning....)
> Or in other words: Wouldn't a HPNDisabled=yes default make more sense?
Maybe. HPN also permits some other things like a null crypto type, which is
useful when you want to use SSH auth, but you don't care about encrypting the
data being sent....
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