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Nathan, thanks so much for all the effort you've put into this. I am |
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quite relieved we now know more about it and that it's no longer a |
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complete mystery. |
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|
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As a data point, I have the issue (my "test site" that is unreachable is |
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ftp.astron.com), and I am on a Fujitsu Lifebook P7120D, which has this |
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processor: |
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|
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* Intel Pentium M Processor Ultra Low Voltage 753 (1.20 GHz, 2 MB L2 |
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cache, 400 MHz FSB) |
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|
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-Joe |
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|
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|
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Nathan Smith wrote: |
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> On 4/20/07, Timothy Redaelli <drizzt@g.o> wrote: |
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>> Can you try to recompile the kernel with gcc 4 but with -O0? |
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>> cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make |
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> |
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> I can confirm that compiling with gcc-4 and COPTFLAGS=-O0 produces a |
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> working kernel (i.e. no malformed tcp packets). This was after I |
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> found that the gcc41 patch is also not causing the problem. After |
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> getting a working kernel with gcc-4 I went back and used the default |
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> COPTFLAGS again and it broke again. So I think this gives us a fair |
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> amount of certainty that the problem is caused by gcc-4 optimizations. |
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> |
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> As to the reason why some FreeBSD users experience this and other do |
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> not, I am not sure. The symptoms (broken TCP traffic to some sites) |
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> depend entirely upon the sites you are connecting to and how your |
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> connections are routed. So it is possible that somebody could have |
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> this problem by not realize it. |
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> |
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> However, using tcpdump I can tell that some machines apparently do not |
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> experience this problem, so it may be processor-specific (which makes |
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> sense given that it is an optimization problem). I use a Pentium M. |
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> What are other people using that have been affected by the problem? |
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> |
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-- |
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