On Wed, 4 May 2005 00:54:23 -0700 (PDT) "Sorin S." <sese_ro@xxxxxxxxx> wrote: > Hi Stephen, > Is this tcpprobe intended for 2.4 kernel? no, it was built for 2.6. It could work in 2.4, but you would need to dig up an old kprobes patch for 2.4 (from ibm), and do some simple tweaks to the socket to tcp cb mapping. > > This is what I get against a 2.6.8-24 kernel: some internal changes to data structures happened about 2.6.10, no big deal look at tcp_input.c you'll see how the macros are different Does that kernel have kprobes? > > > /home/ssuciu/tcpprobe/tcpprobe.c: In function > `jtcp_sendmsg': > /home/ssuciu/tcpprobe/tcpprobe.c:81: warning: > initialization from incompatible pointer type > /home/ssuciu/tcpprobe/tcpprobe.c:83: error: structure > has no member named `snd_nxt' > /home/ssuciu/tcpprobe/tcpprobe.c:83: error: structure > has no member named `snd_una' > /home/ssuciu/tcpprobe/tcpprobe.c:84: error: structure > has no member named `snd_cwnd' > /home/ssuciu/tcpprobe/tcpprobe.c:84: warning: passing > arg 1 of `tcp_current_ssthresh' from incompatible > pointer type > /home/ssuciu/tcpprobe/tcpprobe.c:85: error: structure > has no member named `snd_wnd' > /home/ssuciu/tcpprobe/tcpprobe.c: In function > `jtcp_recvmsg': > /home/ssuciu/tcpprobe/tcpprobe.c:100: warning: > initialization from incompatible pointer type > /home/ssuciu/tcpprobe/tcpprobe.c:104: error: structure > has no member named `rcv_nxt' > /home/ssuciu/tcpprobe/tcpprobe.c:104: warning: passing > arg 1 of `tcp_receive_window' from incompatible > pointer type > make[2]: *** [/home/ssuciu/tcpprobe/tcpprobe.o] Error > 1 > make[1]: *** [_module_/home/ssuciu/tcpprobe] Error 2 > make[1]: Leaving directory `/usr/src/linux-2.6.8-24' > > Cheers, > Sorin > > > --- Stephen Hemminger <shemminger@xxxxxxxx> wrote: > > On Mon, 02 May 2005 19:22:17 +0200 > > Antonio Pinizzotto <antonio.pinizzotto@xxxxxxxxxx> > > wrote: > > > > > > > > Hi everybody. > > > Do you know about any way to read the TCP cwnd > > value (congestion window) > > > on Linux? > > > > > > I have read that on Linux it is not possible to > > enable a socket option > > > (to read to cwnd using the program trpt). > > > > > > Any way to read the cwnd would be good for me. > > > > > > thanks > > > > > > Antonio > > > > I whipped together a hack using kprobe's to get > > graphs for TCP testing. > > You can download it from > > > http://developer.osdl.org/shemminger/prototypes/tcpprobe.tar.gz > > _______________________________________________ > > LARTC mailing list > > LARTC@xxxxxxxxxxxxxxx > > > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc > > _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
