On Sat, Feb 06, 2010 at 04:09:08PM +0100, Sebastiano Pomata wrote: > Il 06/02/10 15:12, Claudio Jeker ha scritto: > > On Sat, Feb 06, 2010 at 01:27:12PM +0100, Sebastiano Pomata wrote: > >> Il 06/02/10 03:55, Stuart Henderson ha scritto: > >>>> 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? > >>> > >>> Yes. > >>> > >> > >> Thank you for the clear answer. Anyway, trying to act on tcp.sendspace > >> isn't affecting the upload capabilities of my OpenBSD server. > >> I tried downloading a file through httpd, via ftp but results are > >> still disappointing: 60-70 kbps between two boxes on the same switch. > >> > >> The box is going to become a webserver, could you please give me more > >> hints about tuning network performance? > >> > > > > Check your links. This sounds like a full-duplex issue between switch and > > machines. On a LAN even with default tcp send/recvspace you should get > > easily get up to 200Mbps. > > > > Just logged through ssh on the server, ifconfig reports: > > re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > lladdr 00:b0:c2:02:5e:a0 > priority: 0 > groups: egress > media: Ethernet autoselect (100baseTX full-duplex,rxpause,txpause) > status: active > inet 192.167.132.99 netmask 0xffffff00 broadcast 192.167.132.255 > inet6 fe80::2b0:c2ff:fe02:5ea0%re0 prefixlen 64 scopeid 0x2 > > As from the name, nic is a common Realtek card (OpenBSD just got it > without need of doing anything). So I suppose nic is running in full > duplex. > Hints? >
Check interface statistics on interface and switch, look for excessive errors or collisions. Both should not happen on a full-duplex link. -- :wq Claudio
