[dpdk-dev] Question about rte_hash ext flags on mulitithread read/write
Lilijun (Jerry)
jerry.lilijun at huawei.com
Thu Mar 5 03:01:18 CET 2020
Hi All,
There is some description about RTE hash's multi-thread support in Programmer's Guide. After reading that I still have some questions as follows:
1) There is a sentence " In all modes of operation lookups are thread-safe meaning lookups can be called from multiple threads concurrently.".
But if the extra_flag is only set RTE_HASH_EXTRA_FLAGS_EXT_TABLE, RTE hash will use a link list to store extend buckets due to excessive hash collisions.
So how can we make sure the link list accesses are safe with reading/writing concurrently?
2) Can we support multithread writing with RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF being set? Do we need add RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD flag?
Any reply will be appreciated very much. Thanks.
Jerry
More information about the dev
mailing list