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| /freebsd-11-stable/sys/ufs/ufs/ | ||
| H A D | ufs_dirhash.c | diff 92807 Wed Mar 20 15:58:02 MST 2002 dwmalone Two minor changes to dirhash, which result in some marginal benchmark improvements. 1) If deleting an entry results in a chain of deleted slots ending in an empty slot, then we can be a bit more aggressive about marking slots as empty. 2) The last stage of the FNV hash is to xor the last byte of data into the hash. This means that filenames which differ only in the last byte will be placed close to one another in the hash table, which forms longer chains. To work around this common case, we also hash in the address of the dirhash structure. news/cancel = news/articles/control/cancel for a tradspool inn server squid2 = squid level 2 directory (dirs called 00->FF) squid3 = squid level 3 directory (files called 00001F00->00001FFF) mean #probes for home dir mh inbox news/cancel tmp squid2 squid3 old successful 1.02 3.19 4.07 1.10 7.85 2.06 new successful 1.04 1.32 1.27 1.04 1.93 1.17 old unsuccessful 1.08 4.50 5.37 1.17 10.76 2.69 new unsuccessful 1.08 1.73 1.64 1.17 2.89 1.37 Reviewed by: iedowse MFC after: 2 weeks |
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