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Reduce dedupe hash table collisions by half.

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This commit is contained in:
Moinak Ghosh 2013-01-31 00:38:41 +05:30
parent 3d8f3ada1c
commit af4c6e1d84
1 changed files with 3 additions and 3 deletions
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6
rabin/rabin_dedup.c
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@ -560,7 +560,7 @@ process_blocks:
DEBUG_STAT_EN(delta_fails = 0);
DEBUG_STAT_EN(hash_collisions = 0);
ary_sz = blknum * sizeof (rabin_blockentry_t *);
ary_sz = (blknum << 1) * sizeof (rabin_blockentry_t *);
htab = (rabin_blockentry_t **)(ctx->cbuf + ctx->real_chunksize - ary_sz);
memset(htab, 0, ary_sz);
@ -598,8 +598,8 @@ process_blocks:
* not enabled then value of similarity_hash == hash.
*/
ck = ctx->blocks[i]->similarity_hash;
ck += (ck / ctx->blocks[i]->length);
j = ck % blknum;
ck ^= (ck / ctx->blocks[i]->length);
j = ck % (blknum << 1);
if (htab[j] == 0) {
/*