patch for test (Was: tcp_output starving -- is due to mbuf get
Jin Guojun [DSD]
j_guojun at lbl.gov
Fri Apr 18 13:04:29 PDT 2003
Opps, there was a bad file -- tcp_input.p -- which is not working yet.
Also, a patch file -- tcp_usrreq.p -- was missing.
I will take the tcp_input.p out and put tcp_usrreq.p in.
When it is finished, I will send another mail out.
Borje Josefsson wrote:
> On Thu, 17 Apr 2003 22:12:02 PDT "Jin Guojun [NCS]" wrote:
> > I have modified the sockbuf and mbuf operation to double the throughput over
> > high bandwidth delay product path.
> > The patch is available at:
> > http://www-didc.lbl.gov/~jin/network/lion/content.html#FreeBSD_Patches
> > The current modification is for tcp transmission only.
> > I have adapted some code of uipc_socket2.c from Sam Leffler
> > http://www.freebsd.org/~sam/thorpe-stable.patch
> > for tcp receiver, but it has not been tested yet, so the tcp_input.p is empty.
> > I ignored all record chain (m_nextpkt) related code. The details is explained at
> > http://www-didc.lbl.gov/~jin/network/lion/content.html#BSDMbuf
> > Once the tcp_input code is tested, I will submit the patch to bugs at freebsd.org.
> > I may submit the patch regardless if tcp_input code works or not, because the
> > tcp
> > sender (server) is more important in high-speed network than the receiver
> > (client).
> > It is appreciated if any one can verify the patch and provide feedback.
> OK. I have now tried this patch on a newly-installed 4.8R. The patch
> applied fine. When the sysctl net.inet.tcp.liondmask is unset, everything
> seems OK, but when setting it to 7 (as specified with the patch
> instructions) i get:
> Fatal trap 12: page fault while in kernel mode.
> (I could write down all the stuff on addresses etc if it makes sense)
> when I run ttcp to test the performance.
> This is repeatable.
> I'm willing to test more, if someone provides me with some hints on what
> to do.
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