Le mercredi 07 octobre 2009 à 17:01 +0200, Anders Broman a écrit :
> Hi,
> If some one's interested here's the emem statistics for the file:
> #define EMEM_ALLOCS_PER_CHUNK (EMEM_PACKET_CHUNK_SIZE / 64)
> PWS Commit
> 43 492 64 512
> 332 052 471 116
> Loading time 54.740
>
> -------- SE allocator statistics --------
> Using chunks, using canaries
> No fully used chunks, nothing to do
>
> -------- SE allocator statistics --------
> Using chunks, using canaries
> No fully used chunks, nothing to do
>
> -------- SE allocator statistics --------
> Using chunks, using canaries
>
> ---------- Allocations from the OS ----------
> ---- Headers ----
> ( Chunk header size: 28
> + Canary header size: 819204)
> * Number of chunks: 24
> -------------------------------------------
> = 19661568 total space used for headers
>
> ---- Buffer space ----
> Chunk allocation size: 10485760
> * Number of chunks: 24
> -------------------------------------------
> = 251461632 (251658240 including guard pages) total space used for buffe
> rs
> -------------------------------------------
> Total allocated from OS: 271123200
>
> ---------- Allocations from the SE pool ----------
> Number of SE allocations: 3932160
> Bytes used (incl. canaries): 144507024
> Bytes used for canaries: 35148246
> Bytes unused (wasted): 106954608
>
> ---------- Statistics ----------
> Average SE allocation size (incl. canaries): 36.75
> Average SE allocation size (excl. canaries): 27.81
> Average wasted bytes per allocation: 27.20
> Space used for headers + unused allocation: 107773840
> --> % overhead/waste: 39.75
>
> Allocation distribution (sizes include canaries):
> size < 32: 697363
> size < 64: 2547659
> size < 128: 686123
> size < 256: 20722
> size < 512: 717
> size < 1024: 0
> size < 2048: 0
> size < 4096: 0
> size < 8192: 0
> size > 16384: 4
>
> Regards
> Anders
Not very good.
But are canaries used at all? In my understanding without
DEBUG_INTENSE_CANARY_CHECKS they are never checked and it's unset by
default.
You can try with
setenv WIRESHARK_DEBUG_SE_NO_CANARY
but first replace the padding with the right value: in emem.c
@@ -524,7 +467,7 @@
if (use_canary)
pad = emem_canary_pad(size);
else
- pad = 8;
+ pad = ((8 - (size & 0x7)) & 0x7);
size += pad;
Didier
