Date: Fri, 18 Apr 2003 18:58:07 +0200 From: Borje Josefsson <bj@dc.luth.se> To: "Jin Guojun [NCS]" <j_guojun@lbl.gov> Cc: freebsd-performance@freebsd.org Subject: Re: patch for test (Was: tcp_output starving -- is due to mbuf get delay?) Message-ID: <200304181658.h3IGw72F021961@dc.luth.se> In-Reply-To: Your message of Thu, 17 Apr 2003 22:12:02 PDT. <3E9F8922.1166ABA8@lbl.gov>
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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@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. --Börje
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