Re: [gentoo-bsd] TCP (FTP) problem - some sites - while emerging

[Nicholas Steicke]

Nathan Smith wrote:
> On 4/20/07, Timothy Redaelli <drizzt@g.o> wrote:
>> Can you try to recompile the kernel with gcc 4 but with -O0?
>> cd /usr/src/sys/i386/compile/GENERIC ; COPTFLAGS=-O0 make
>
> I can confirm that compiling with gcc-4 and COPTFLAGS=-O0 produces a
> working kernel (i.e. no malformed tcp packets).  This was after I
> found that the gcc41 patch is also not causing the problem.  After
> getting a working kernel with gcc-4 I went back and used the default
> COPTFLAGS again and it broke again.  So I think this gives us a fair
> amount of certainty that the problem is caused by gcc-4 optimizations.
>
> As to the reason why some FreeBSD users experience this and other do
> not, I am not sure.  The symptoms (broken TCP traffic to some sites)
> depend entirely upon the sites you are connecting to and how your
> connections are routed.  So it is possible that somebody could have
> this problem by not realize it.
>
> However, using tcpdump I can tell that some machines apparently do not
> experience this problem, so it may be processor-specific (which makes
> sense given that it is an optimization problem).  I use a Pentium M.
> What are other people using that have been affected by the problem?
>

Hey, i had this issue on a Celeron something (the one prior to the 
coppermine series).

After reading a bug on the FreeBSD site ( 
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/34756 ) i worked out i 
could connect to anything with an ip matching 
[1-209].[1-209].[1-209].[1-209] (ie. if any section of an ip was >=210, 
it would time out) - i tried compiling with '-O0' however the kernel 
still didnt work, even after doing 2x 'emerge -e system' (after much 
pain getting all the packages onto the box) -- any help getting gfbsd 
working would be great!

-- 
--------------------------------
Email: narthollis@××××××××××.net
-- 
gentoo-bsd@g.o mailing list