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Re: [lwip-users] IP Address Display Functions
From: |
Mandeep Sandhu |
Subject: |
Re: [lwip-users] IP Address Display Functions |
Date: |
Tue, 25 Aug 2009 11:57:29 +0530 |
> I'd like to add that the packing around struct ip_addr is also unnecessary.
> Although it seems benign, it's not. My version of GCC (NIOS) treats this
> packed struct as char array and does 4 byte loads, ANDs, shifts, and ORs
> everywhere this stuct was used. I simply use:
>
> struct ip_addr {
> u32_t addr;
> };
I second it.
I get whole bunch of warnings for etharp.h as well (I'm using it with
ecos, using
their gcc "i386-elf". I get warnings for the "struct etharp_hdr" as well.
One has to painfully sift through all these warnings to find out if
your own code is
responsible for any one of them.
Why can't we have a single "packed" attribute at the end of the struct instead
of using it each time at the field level?
I'm using an older version of lwIP - 1.1.1. Please ignore my rant if
this is already
fixed.
Thanks,
-mandeep
>
> If there was a reason for the packing, I don't see it. If it's used within
> another struct, the packing of the outer struct defines the behavior. On
> the NIOS GCC build, this was one of the 3 non-code-changing optimizations I
> made that had a noticeable effect on bandwidth and codesize of both UDP and
> TCP. I think this has to be because the ip_addr struct is so heavily used.
> I recommend the patch above. If there's an argument that packing is
> required for a single member struct, I'm interesting seeing the reason or
> proof that it's required.
>
> Bill
>
>
>
>
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> lwip-users mailing list
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> http://lists.nongnu.org/mailman/listinfo/lwip-users
>
- [lwip-users] Possible deadlock in LWIP 1.3.1 RC1, Eran Rundstein, 2009/08/23
- Re: [lwip-users] Possible deadlock in LWIP 1.3.1 RC1, Kieran Mansley, 2009/08/24
- RE: [lwip-users] IP Address Display Functions, Kieran Mansley, 2009/08/25
- RE: [lwip-users] IP Address Display Functions, Kieran Mansley, 2009/08/25
- RE: [lwip-users] IP Address Display Functions, Kieran Mansley, 2009/08/25
- [lwip-users] Re: IP Address Display Functions, Jakob Stoklund Olesen, 2009/08/25
- RE: [lwip-users] Re: IP Address Display Functions, Bill Auerbach, 2009/08/25
- Re: [lwip-users] Re: IP Address Display Functions, address@hidden, 2009/08/25
- Re: [lwip-users] Re: IP Address Display Functions, address@hidden, 2009/08/25
- RE: [lwip-users] Re: IP Address Display Functions, Bill Auerbach, 2009/08/26