Re: [PATCH V2] libibverbs: Allow arbitrary int values for MTU

["Jeff Squyres (jsquyres)" <jsquyres-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>]

Bump.

On Jul 10, 2013, at 8:14 AM, Jeff Squyres (jsquyres) <jsquyres@cisco.com> wrote:

> On Jul 8, 2013, at 1:26 PM, Jason Gunthorpe <jgunthorpe@obsidianresearch.com> wrote:
> 
>> Jeff's patch doesn't break old binaries, old binaries, running with
>> normal IB MTUs work fine. The structure layouts all stay the same,
>> etc.
> 
> 
> FWIW, I did a simple test to confirm this.  I installed a stock git HEAD libibverbs into $HOME/libibverbs-HEAD and a libibverbs with the MTU patch in $HOME/libibverbs-mtu-patch.  The mlx4 driver was installed into both trees (I used some fairly old Mellanox HCAs+Dell servers for this test).
> 
> This is the base case:
> 
> -----
> [5:06] dell012:~ ❯❯❯ cd libibverbs-HEAD
> [5:07] dell012:~/libibverbs-HEAD ❯❯❯ ldd bin/ibv_rc_pingpong
> 	linux-vdso.so.1 =>  (0x00002aaaaaacb000)
> 	libibverbs.so.1 => /home/jsquyres/libibverbs-HEAD/lib/libibverbs.so.1 (0x00002aaaaaccd000)
> 	libpthread.so.0 => /lib64/libpthread.so.0 (0x00002aaaaaeec000)
> 	libdl.so.2 => /lib64/libdl.so.2 (0x00002aaaab109000)
> 	libc.so.6 => /lib64/libc.so.6 (0x00002aaaab30e000)
> 	/lib64/ld-linux-x86-64.so.2 (0x00002aaaaaaab000)
> [5:07] dell012:~/libibverbs-HEAD ❯❯❯ ./bin/ibv_rc_pingpong dell011
>  local address:  LID 0x0004, QPN 0x04004a, PSN 0xc08742, GID ::
>  remote address: LID 0x0019, QPN 0x20004a, PSN 0x44c48e, GID ::
> 8192000 bytes in 0.02 seconds = 4170.28 Mbit/sec
> 1000 iters in 0.02 seconds = 15.72 usec/iter
> -----
> 
> Works fine.  Now let's use the same libibverbs-HEAD rc pingpong binary, but with the MTU-patched libibverbs.so:
> 
> -----
> [5:07] dell012:~/libibverbs-HEAD ❯❯❯ mv lib/libibverbs.so.1 lib/libibverbs.so.1-bogus
> [5:07] dell012:~/libibverbs-HEAD ❯❯❯ export LD_LIBRARY_PATH=$HOME/libibverbs-mtu-patch/lib
> [5:08] dell012:~/libibverbs-HEAD ❯❯❯ ldd bin/ibv_rc_pingpong
> 	linux-vdso.so.1 =>  (0x00002aaaaaacb000)
> 	libibverbs.so.1 => /home/jsquyres/libibverbs-mtu-patch/lib/libibverbs.so.1 (0x00002aaaaaccd000)
> 	libpthread.so.0 => /lib64/libpthread.so.0 (0x00002aaaaaeed000)
> 	libdl.so.2 => /lib64/libdl.so.2 (0x00002aaaab10a000)
> 	libc.so.6 => /lib64/libc.so.6 (0x00002aaaab30e000)
> 	/lib64/ld-linux-x86-64.so.2 (0x00002aaaaaaab000)
> [5:08] dell012:~/libibverbs-HEAD ❯❯❯ ./bin/ibv_rc_pingpong dell011
>  local address:  LID 0x0004, QPN 0x08004a, PSN 0x65391c, GID ::
>  remote address: LID 0x0019, QPN 0x24004a, PSN 0x7d137e, GID ::
> 8192000 bytes in 0.02 seconds = 4163.39 Mbit/sec
> 1000 iters in 0.02 seconds = 15.74 usec/iter
> -----
> 
> Still works fine.


-- 
Jeff Squyres
jsquyres@cisco.com
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