SCP issue on FreeBSD

[Juraj Bocinec]

Greetings, i'm no expert but doesn't this have to do something with 
network send/receive buffers? They're not set the same by default:

[root at schizo /etc]# sysctl -a|grep send
kern.cam.ada.ada_send_ordered: 1
kern.cam.da.da_send_ordered: 1
net.local.stream.sendspace: 8192
net.inet.ip.sendsourcequench: 0
net.inet.igmp.sendlocal: 1
net.inet.igmp.sendra: 1
net.inet.tcp.sendspace: 32768
net.inet.tcp.sendbuf_max: 262144
net.inet.tcp.sendbuf_inc: 8192
net.inet.tcp.sendbuf_auto: 1
net.inet.sctp.sendspace: 233016
net.raw.sendspace: 8192
[root at schizo /etc]# sysctl -a|grep recv
net.local.stream.recvspace: 8192
net.local.dgram.recvspace: 4096
net.inet.igmp.recvifkludge: 1
net.inet.tcp.recvspace: 65536
net.inet.tcp.recvbuf_max: 262144
net.inet.tcp.recvbuf_inc: 16384
net.inet.tcp.recvbuf_auto: 1
net.inet.udp.recvspace: 42080
net.inet.sctp.recvspace: 233016
net.inet.raw.recvspace: 9216
net.raw.recvspace: 8192

Juraj Bocinec

On 2016-02-09 05:39, Venkateswara Rao Dokku wrote:
> Hi,
> 
> I am using FreeBSD 8.4 as guest on top of the linux (ubuntu 14.10) 
> host. I
> observed that, the Pushing a file from FreeBSD is giving good 
> performance
> over Puling a file from other linux box to FreeBSD.
> 
> root at test:~ # *scp ns-10.5-57.7.gz root at 10.102.38.202:/root*
> root at 10.102.38.202's password:
> ns-10.5-57.7.gz                                                      
> 100%
>  126MB  *63.0MB/s*   00:02
> root at test:~ #* scp root at 10.102.38.202:/root/ns-10.5-57.7.gz* .
> root at 10.102.38.202's password:
> ns-10.5-57.7.gz                                                      
> 100%
>  126MB  *11.5MB/s*   00:11
> 
> Why there is a difference between these two?. Any tuning needs to be 
> done
> on the FreeBSD guest to get these two almost same?
> 
> To see, whether its specific to FreeBSD I did the same experiment with
> Linux(Ubuntu 14.10) as guest on top of Linux(same host as above). Here 
> the
> output is almost same.
> 
> root at ubuntu:~# *scp root at 10.102.38.202:/root/ns-11.1-14.4.gz .*
> root at 10.102.38.202's password:
> ns-11.1-14.4.gz                                                        
> 100%
>  130MB  *64.8MB/s*   00:02
> root at ubuntu:~# *scp ns-11.1-14.4.gz root at 10.102.38.202:/roo*t
> root at 10.102.38.202's password:
> ns-11.1-14.4.gz
> 100%  130MB  *64.8MB/s*   00:02
> 
> 
> Moreover, in most cases Linux performance is better than FreeBSD. Is 
> Ubuntu
> gives good performance when compared to FreeBSD?
> 
> Any help is much appreciated.
> Thanks.