Date: Mon, 7 May 2001 17:15:20 -0500 From: Bob Willcox <bob@immure.com> To: "Kenneth D. Merry" <ken@kdm.org> Cc: hackers list <freebsd-hackers@freebsd.org> Subject: Re: Realy LARGE TCP/IP Window Size? Message-ID: <20010507171520.C64063@luke.immure.com> In-Reply-To: <20010507164531.A64063@luke.immure.com>; from bob@immure.com on Mon, May 07, 2001 at 04:45:31PM -0500 References: <20010507162005.C55671@luke.immure.com> <20010507153802.A2669@panzer.kdm.org> <20010507164531.A64063@luke.immure.com>
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On Mon, May 07, 2001 at 04:45:31PM -0500, Bob Willcox wrote: > On Mon, May 07, 2001 at 03:38:02PM -0600, Kenneth D. Merry wrote: > > On Mon, May 07, 2001 at 16:20:05 -0500, Bob Willcox wrote: > > > > > > I am working on a FreeBSD device driver for my Co's GSN adapter and need > > > to be able to set my TCP/IP window size to 512KB (or perhaps more). I > > > have tried doing this with sysctl: > > > > > > root@sebulba:p0 /root> sysctl -w net.inet.tcp.recvspace=524288 > > > net.inet.tcp.recvspace: 131072 -> 524288 > > > root@sebulba:p0 /root> sysctl -w net.inet.tcp.sendspace=524288 > > > net.inet.tcp.sendspace: 131072 -> 524288 > > > > > > and although the sysctl happily takes the specification, when I attempt > > > an ftp command I get: > > > > > > root@sebulba:p0 /root> ftp 192.168.1.2 > > > ftp: socket: No buffer space available > > > > > > This is on a FreeBSD 4.0-stable system: > > > > > > FreeBSD sebulba.vieo.com 4.0-STABLE FreeBSD 4.0-STABLE #202: Mon May 7 15:09:46 CDT 2001 bob@sebulba.vieo.com:/usr/src/sys/compile/GPXTEST i386 > > > > > > Anybody have any ideas what I need to do to get this to work? > > > > sysctl -w net.inet.tcp.rfc1323=1 > > > > You need that to be able to set your window size to anything over 64K. I > > think there's an rc.conf knob to do that so you don't have to tweak it > > manually every time. > > Thanks, I'll give this a try. I tried setting the above sysctl but that didn't have any effect on the problem. Through a binary search of send and recv space settings I was able to determine that anything over 227 KB (232448 bytes) fails when I attempt to open a TCP socket. Bob [snip] > > > > > Ken > > -- > > Kenneth Merry > > ken@kdm.org > > -- > Bob Willcox Living your life is a task so difficult, > bob@vieo.com it has never been attempted before. > Austin, TX -- Unknown -- Bob Willcox Living your life is a task so difficult, bob@vieo.com it has never been attempted before. Austin, TX -- Unknown To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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