Date: Thu, 27 Mar 2008 10:41:48 -0700 (PDT) From: Abdullah Ibn Hamad Al-Marri <wearabnet@yahoo.ca> To: pyunyh@gmail.com, Ian FREISLICH <ianf@clue.co.za> Cc: FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD STABLE <freebsd-stable@freebsd.org> Subject: Re: Packet corruption in re0 Message-ID: <626860.36996.qm@web33702.mail.mud.yahoo.com>
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----- Original Message ---- > From: Pyun YongHyeon <pyunyh@gmail.com> > To: Ian FREISLICH <ianf@clue.co.za> > Cc: FreeBSD Current <freebsd-current@freebsd.org>; Robert Backhaus <robbak@robbak.com> > Sent: Monday, March 17, 2008 8:12:03 AM > Subject: Re: Packet corruption in re0 > > On Fri, Feb 22, 2008 at 10:43:22AM +0200, Ian FREISLICH wrote: > > Pyun YongHyeon wrote: > > > On Thu, Feb 21, 2008 at 01:18:18PM +0200, Ian FREISLICH wrote: > > > > Pyun YongHyeon wrote: > > > > > On Thu, Feb 21, 2008 at 02:47:43PM +1000, Robert Backhaus wrote: > > > > > > On Thu, Feb 21, 2008 at 1:50 PM, Pyun YongHyeon > wr > > ote: > > > > > > > On Thu, Feb 21, 2008 at 11:03:02AM +1000, Robert Backhaus wrote: > > > > > > > > I am experiencing roughly 15% packet corruption on the re > inter > > face > > > > on > > > > > > > > my freebsd 7/amd64 box. > > > > > > > > > > > > > > > > FreeBSD gw.flexi.robbak.com 7.0-PRERELEASE FreeBSD > 7.0-PRERELEA > > SE #8 > > > > : > > > > > > > > Tue Feb 5 09:49:55 EST 2008 > > > > > > > > root@gw.flexi.robbak.com:/usr/obj/usr/src/sys/GW amd64 > > > > > > > > > > > > > > > > Just to make troubleshooting difficult, this problem only > shows > > up > > > > > > > > after the system has been up for roughly 36 hours, depending > on > > the > > > > > > > > amount of traffic. > > > > > > > > > > > > > > > > > > > > > > I didn't take a look attached tcpdump files but I guess the > > > > > > > instability issue was fixed in HEAD. It's not yet MFCed but > > > > > > > I'll handle it in a week. > > > > > > > > > > > > > > Would you try re(4) in HEAD? > > > > > > > > > > > > > > > > > > > OK, I'll do that. What is the best way to do that? csupping to "." > se > > ems a > > > > > > bit drastic, and I don't do much with cvs proper. I take it that I > sh > > ould > > > > use > > > > > > anon-cvs to grab the directory, but I don't quite know how. > > > > > > > > > > > > > > > > Copy sys/dev/re/if_re.c, sys/pci/if_rlreg.h in HEAD to your box. > > > > > Due to lack of m_defrag(9) in 7-PRERELEASE/RC, you also have to add > > > > > that function to if_re.c(Copy m_defrag() in sys/kern/uipc_mbuf.c on > > > > > HEAD/RELENG_7 to if_re.c). That would make it build on your box. > > > > > > > > This doesn't solve the problem that I'm seeing on re(4) interfaces. > > > > It basically shows up as quagga establishing OSPF neighours as > > > > "Exchange/DR" when VLAN hardware tagging is enabled. I'm running > > > > OSPF over 802.1Q vlans. Neighbours are correctly negotiated once > > > > VLAN hardware tagging is disabled on the interface. > > > > > > > > I'll do more debugging. > > > > > > > > > > Hmm. That sounds like different issue to me. I guess I din't change > > > any semantics in VLAN H/W tagging. Do you still the same VLAN H/W > > > tagging related issues on RELENG_7? > > > > > > To narrow down the issue it would be even better to know which parts > > > of H/W assistance was broken. For example, > > > - Disable checksum offload for VLAN interface first and check > > > whether quagga works. > > > > You can only disable offload on the parent interface. > > > > > - Disable checksum offload for parent interface and check again. > > > If you can post tcpdump output for broken conntection it may help a > > > lot to diagnose the issue. > > > > The only flag affecting this behaviour is vlanhwtag. Various > > permutations of the interface flags make no difference to this > > behaviour as long as hardware tagging is enabled. > > > > It seems like it's corrupting large packets on transmit when vlanhwtag > > is enabled. From the tcpdump output it looks like a padding or > > packet length issue. > > > > Here's what tcpdump on the re(4) device thinks it's transmitting: > > > > 00:08:a1:3c:32:9c > 00:90:fb:0c:89:7d, ethertype 802.1Q (0x8100), length > 1510: vlan 1000, p 0, ethertype IPv4, 196.22.138.92 > 196.22.138.89: OSPFv2, > Database Description, length: 1472 > > > > Here's what was actually recieved by the em(4) device on the > > neighbour. Note the absense of the 801.1Q header: > > > > 00:08:a1:3c:32:9c > 00:90:fb:0c:89:7d, ethertype IPv4 (0x0800), length 1506: > 196.22.138.92 > 196.22.138.89: OSPFv2, Database Description, length: 1472 > > > > When vlanhwtagging is disabled, the re(4) device transmits: > > > > 00:90:fb:0c:89:7d > 00:08:a1:3c:32:9c, ethertype 802.1Q (0x8100), length > 1510: vlan 1000, p 0, ethertype IPv4, 196.22.138.89 > 196.22.138.92: OSPFv2, > Database Description, length: 1472 > > > > and the em(4) device recieves: > > > > 00:08:a1:3c:32:9c > 00:90:fb:0c:89:7d, ethertype 802.1Q (0x8100), length > 1510: vlan 1000, p 0, ethertype IPv4, 196.22.138.92 > 196.22.138.89: OSPFv2, > Database Description, length: 1472 > > > > Let me know if you need more detailed tcpdump output than I've provided. > > > > I guess I've found a VLAN hardware tagging bug in re(4). > Please try this one and let me know the result. > http://people.freebsd.org/~yongari/re/if_re.c > http://people.freebsd.org/~yongari/re/if_rlreg.h > > > Ian > > > > -- > > Ian Freislich > > > > -- > Regards, > Pyun YongHyeon Pyun, I used it, and I got no bufer space available message, I run a server with heavey http requests and named as we.. so I had to increase the buffer. www# netstat -m 553/1862/2415 mbufs in use (current/cache/total) 279/1007/1286/65536 mbuf clusters in use (current/cache/total/max) 279/768 mbuf+clusters out of packet secondary zone in use (current/cache) 56/812/868/12800 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) 920K/5727K/6647K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/0/0 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 41261 requests for I/O initiated by sendfile 0 calls to protocol drain routines Can you make a patch for the changes you made in HEAD for RELENG_7? Regards, -Abdullah Ibn Hamad Al-Marri Arab Portal http://www.WeArab.Net/ ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
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