Re: abysmally low scp performance

[mlelstv%serpens.de@localhost (Michael van Elst)]

ef%math.uni-bonn.de@localhost (Edgar =?iso-8859-1?B?RnXf?=) writes:

>> I do not understand why you expect more than 1000 Mbits/s.
>I would expect close to 1000 Mbit/s, say, 800.

A common good value is 920-940Mbit/s for TCP alone. ssh then
depends on CPU performance.

[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-7.00   sec   797 MBytes   955 Mbits/sec    0             sender

% ssh remotehost dd if=/dev/zero bs=1024k count=10240 > /dev/null
10240+0 records in
10240+0 records out
10737418240 bytes transferred in 94.463 secs (113667978 bytes/sec)

% scp /Home/anita/disk.img .
disk.img                                      100% 1536MB 105.2MB/s 110.9MB/s  

That's NetBSD-9 vs. NetBSD-current on 7-year old hardware.


>> There have been reports that HPN isn't working well.
>> So turn it off and move on.
>That's what I did.

That HPN patch is old, the current (patch, not NetBSD) one is better.
But for most people, disabling is much easier.