Tuning: 100mbit faster, gbit slower.

Jin Guojun [VFFS] j_guojun at lbl.gov
Mon Mar 24 05:40:38 UTC 2008


You cannot do blind tuning according those numbers. They are for 
1-10Gbps pipe.
The proper number is "pipe diamter" x "pipe length" = capacity

In your case, the maximum number = 100Mbps x "delay from your machine to 
server"

-Jin

Daniel Andersson wrote:

>Hey!
>
>I was trying to milk the most out of my 100/100. What I
>ended up with was something, to me, quite odd. When I
>hadn't done anything I could ftp things from my server
>box at 50mb/s and run rtorrent at about 9-10 mb/s at most.
>After my "tuning" I can only ftp at a very "choppy"
>30-40mb/s, but rtorrent runs at about 11mb/s.
>This is what I did:
>
>kern.ipc.maxsockbuf=16777216
>net.inet.tcp.sendbuf_max=16777216
>net.inet.tcp.recvbuf_max=16777216
>
>according to
>http://dsd.lbl.gov/TCP-tuning/FreeBSD.html
>every other setting there was default
>I believe.
>
>I also set these:
>
>net.inet.tcp.recvspace: 262144
>net.inet.tcp.sendspace: 262144
>
>dmesg:
>http://pastebin.org/24780
>
>Am I just imagining that rtorrent runs faster?
>Can't ftp handle high buffers or did I mess
>something up? Is there something else I
>could do to make it faster? Setting up
>polling perhaps?
>
>Cheers,
>Daniel Andersson
>  
>


More information about the freebsd-performance mailing list