On Fri, Feb 05, 2010 at 08:59:44AM +0100, Sebastiano Pomata wrote: > On Fri, 5 Feb 2010 02:05:49 +0000 (UTC) > Stuart Henderson <[email protected]> wrote: > > > On 2010-02-04, Sebastiano Pomata <[email protected]> wrote: > > > As doublechecking, I tried with another fast server inside the wan > > > network of our academy, and I'm getting almost the same results > > > (while absolute speeds are different from before, the gap is almost > > > the same in magnitude). > > > > > > I've read the page about tcptune, it's pretty clear now (values are > > > almost the same I edited), still not having clear why on default > > > OpenBSD the transfer rates are so low. > > > > we try to have safe defaults for the varioous machines/arch that > > can run OpenBSD. > > > > we would need some kind of auto-tuning to incrrease the defaults, > > and don't have that yet. > > > > I really can understand this, for the sake of system portability and so > on. Anyway, I really hardly understand why, without touching any of the > default settings, download rate from every server would never overcome > the value of 400 kB/s. Is it all due to the tcp windows size? >
# sysctl net.inet.tcp | grep space net.inet.tcp.recvspace=16384 net.inet.tcp.sendspace=16384 # ftp ftp://mirror.switch.ch/pub/OpenBSD/snapshots/i386/install47.iso ... Retrieving pub/OpenBSD/snapshots/i386/install47.iso local: install47.iso remote: install47.iso 150 Opening BINARY mode data connection for install47.iso (255594496 bytes). 100% |**************************************************| 243 MB 00:33 226 File send OK. 255594496 bytes received in 33.38 seconds (7.30 MB/s) 221 Goodbye. Yep, only 400kB/s, no wait... The use of every should be considered carefully. Yes, our default window size limits download speed. It is known and there is work ongoing to resolve this in a better way then just bumping the limit. -- :wq Claudio
