Date: Wed, 15 Dec 1999 15:54:30 +1300 From: "Juha Saarinen" <juha@saarinen.org> To: "Mike Tancsa" <mike@sentex.net> Cc: <questions@freebsd.org> Subject: RE: Not such good networking performance with FreeBSD Message-ID: <LNBBIBDBFFCDPLBLLLHFEEALGGAA.juha@saarinen.org> In-Reply-To: <3856fea7.1645869304@mail.sentex.net>
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Hi Mike,
> Are you sure its not a duplex issue with your network card ?
Don't think so -- upon boot-up, the card (a DEC 21140 10/100 clone) is being
put into 100Mbps full duplex. At least that's what the system tells me.
Ifconfig -a seems to imply it's only running in 100BaseTX mode:
de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 192.168.1.1 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:00:e8:4a:bf:96
media: autoselect (100baseTX) status: active
supported media: autoselect 100baseTX <full-duplex> 100baseTX
10baseT/UTP <full-duplex> 10baseT/UTP
> If thats not
> the case, it might be that if you are getting a lot of errors on your xDSL
> connection. FreeBSD does not seem to fair well where there are a lot of
> errors. Have a look through the archives, there was a discussion about
> this a few months ago.
Thanks -- the RADSL line here is reasonably free from errors, thank
goodness. I've got an external router connected to a switch to which the
rest of my small LAN is hooked up as well.
I thought it might be the low values for the TCP receive and send buffers --
16KB by default. I upped them to 65K with:
sysctl -w net.inet.tcp.recvspace=65536
sysctl -w net.inet.tcp.sendspace=65536
but it didn't really make any difference.
Going through the sysctl options, I noticed several which may or may not
affect performance:
Don't know what these do, but I presume they're for LANS:
net.local.stream.sendspace: 8192
net.local.stream.recvspace: 8192
net.local.dgram.maxdgram: 2048
net.local.dgram.recvspace: 4096
Could this one have anything to do with IP routing:
net.inet.ip.fastforwarding: 0
RFC 1323 extensions are useful for me:
net.inet.tcp.rfc1323: 1
Is this the default maximum segment size?
net.inet.tcp.mssdflt: 512
The TCP send and receive buffers:
net.inet.tcp.sendspace: 65536
net.inet.tcp.recvspace: 65536
Hmmm... Delayed ACKs?
net.inet.tcp.delayed_ack: 1
UDP datagram sizes?
net.inet.udp.maxdgram: 9216
net.inet.udp.recvspace: 41600
Now what's this then? I increased the raw.recvspace, but I'm not sure what
good it would do:
net.inet.raw.maxdgram: 8192
net.inet.raw.recvspace: 65536
Where are all these options described? The man page isn't much use.
Cheers,
-- Juha
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