Re: kern/140326: em0: watchdog timeout when communicating to windows using 9K MTU

[Jack Vogel]

The following reply was made to PR kern/140326; it has been noted by GNATS.

From: Jack Vogel <jfvogel@...>
To: Maxim Sobolev <sobomax@...>
Cc: freebsd-gnats-submit@...
Subject: Re: kern/140326: em0: watchdog timeout when communicating to windows
        using 9K MTU
Date: Thu, 5 Nov 2009 21:05:11 -0800

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 Good, that's a start. Now, is there a switch of some sort involved or are
 you going
 back to back? Some switches have problems with jumbo frames, there are also
 some vendors (including our's) interfaces that do not support jumbo frames,
 so
 you need to check on that also (I mean the RT).
 
 I will check on the Intel adapter tomorrow.
 
 Jack
 
 
 On Thu, Nov 5, 2009 at 6:28 PM, Maxim Sobolev <sobomax@...> wrote:
 
 > Jack Vogel wrote:
 >
 >> Can't do much unless you adequately identify hardware, on BOTH sides,
 >> believe
 >> it or not "windows" is not a sufficient description :)
 >>
 >> I need to know what the E1000 hardware is, using pciconf -l, and I also
 >> need to
 >> know what is on the Windows side before having a clue on how to repro or
 >> help
 >> you.
 >>
 >
 > Jack,
 >
 > Thank you for the amazingly fast reply.
 >
 > Sure, FreeBSD side is this:
 >
 > em0@pci0:0:25:0:        class=0x020000 card=0x02761028 chip=0x10de8086
 > rev=0x02 hdr=0x00
 >    vendor     = 'Intel Corporation'
 >    class      = network
 >    subclass   = ethernet
 >
 > On windows side it's Realtek GiGe card. The system itself is Windows 7
 > Ultimate 64-bit edition:
 >
 > PCI\VEN_10EC&DEV_8168&SUBSYS_02C01028&REV_03
 >
 > Please let me know if any other information is necessary.
 >
 > Regards,
 > --
 > Maksym Sobolyev
 > Sippy Software, Inc.
 > Internet Telephony (VoIP) Experts
 > T/F: [phone]
 > Web: http://www.sippysoft.com
 > MSN: sales@...
 > Skype: SippySoft
 >
 
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 Good, that's a start. Now, is there a switch of some sort involved or a=
 re you going<br>back to back? Some switches have problems with jumbo frames=
 , there are also<br>some vendors (including our's) interfaces that do n=
 ot support jumbo frames, so<br>
 you need to check on that also (I mean the RT).<br><br>I will check on the =
 Intel adapter tomorrow.<br><br>Jack<br><br><br><div class=3D"gmail_quote">O=
 n Thu, Nov 5, 2009 at 6:28 PM, Maxim Sobolev <span dir=3D"ltr"><<a href=
 =3D"mailto:sobomax@...">sobomax@...</a>></span> wrote:<b=
 r>
 <blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class=3D"im"=
 >Jack Vogel wrote:<br>
 <blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
 Can't do much unless you adequately identify hardware, on BOTH sides, b=
 elieve<br>
 it or not "windows" is not a sufficient description :)<br>
 <br>
 I need to know what the E1000 hardware is, using pciconf -l, and I also nee=
 d to<br>
 know what is on the Windows side before having a clue on how to repro or he=
 lp<br>
 you.<br>
 </blockquote>
 <br></div>
 Jack,<br>
 <br>
 Thank you for the amazingly fast reply.<br>
 <br>
 Sure, FreeBSD side is this:<br>
 <br>
 em0@pci0:0:25:0: =A0 =A0 =A0 =A0class=3D0x020000 card=3D0x02761028 chip=3D0=
 x10de8086 rev=3D0x02 hdr=3D0x00<br>
  =A0 =A0vendor =A0 =A0 =3D 'Intel Corporation'<br>
  =A0 =A0class =A0 =A0 =A0=3D network<br>
  =A0 =A0subclass =A0 =3D ethernet<br>
 <br>
 On windows side it's Realtek GiGe card. The system itself is Windows 7 =
 Ultimate 64-bit edition:<br>
 <br>
 PCI\VEN_10EC&DEV_8168&SUBSYS_02C01028&REV_03<br>
 <br>
 Please let me know if any other information is necessary.<br>
 <br>
 Regards,<br><font color=3D"#888888">
 -- <br>
 Maksym Sobolyev<br>
 Sippy Software, Inc.<br>
 Internet Telephony (VoIP) Experts<br>
 T/F: [phone]<br>
 Web: <a href=3D"http://www.sippysoft.com" target=3D"_blank">http://www.sipp=
 ysoft.com</a><br>
 MSN: <a href=3D"mailto:sales@..." target=3D"_blank">sales@sippyso=
 ft.com</a><br>
 Skype: SippySoft<br>
 </font></blockquote></div><br>
 
 --0016e6dab0fde1e7870477acc9ad--
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[Maxim Sobolev-2]

The following reply was made to PR kern/140326; it has been noted by GNATS.

From: Maxim Sobolev <sobomax@...>
To: Jack Vogel <jfvogel@...>
Cc: freebsd-gnats-submit@...
Subject: Re: kern/140326: em0: watchdog timeout when communicating to windows
  using 9K MTU
Date: Fri, 06 Nov 2009 00:30:33 -0800

 Jack Vogel wrote:
 > Good, that's a start. Now, is there a switch of some sort involved or
 > are you going
 > back to back? Some switches have problems with jumbo frames, there are also
 > some vendors (including our's) interfaces that do not support jumbo
 > frames, so
 > you need to check on that also (I mean the RT).
 >
 > I will check on the Intel adapter tomorrow.
 
 Yes, there is switch involved (Cisco/Linksys EG008W ver.3), but I don't
 think it's related. The problem has really escalated when I installed
 Windows 7 on this machine yesterday. Before that the same machine with
 Realtek was running Vista and this problem had happened to me only once
 or twice in two weeks with the same MTU on both ends. And from the
 capture it seems like the very specific condition causes this.
 Unfortunately this box is a gateway for a network, so that I cannot
 replace hub and try to reproduce the issue.
 
 -Maxim
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[Maxim Sobolev-2]

The following reply was made to PR kern/140326; it has been noted by GNATS.

From: Maxim Sobolev <sobomax@...>
To: Jack Vogel <jfvogel@...>
Cc: freebsd-gnats-submit@...
Subject: Re: kern/140326: em0: watchdog timeout when communicating to windows
  using 9K MTU
Date: Fri, 06 Nov 2009 01:58:52 -0800

 Jack,
 
 Here is some additional info you might find useful: I have replaced
 Linksys switch with more "professional" rack-mountable 3Com Baseline
 2816 switch and reproduced the issue just as easy by copying large file
 via SMB from FReeBSD to Windows 7. To me it pretty much rules out any
 problems with the switch.
 
 Hope it helps.
 
 -Maxim
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