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3740 Poor ZFS send / receive performance due to snapshot hold / release processing
Submitted by: Steven Hartland <steven.hartland@multiplay.co.uk>

*** 834,860 **** { zap_attribute_t za; zap_cursor_t zc; objset_t *mos = dp->dp_meta_objset; uint64_t zapobj = dp->dp_tmp_userrefs_obj; if (zapobj == 0) return; ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); for (zap_cursor_init(&zc, mos, zapobj); zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { char *htag; uint64_t dsobj; htag = strchr(za.za_name, '-'); *htag = '\0'; ++htag; ! dsobj = strtonum(za.za_name, NULL); ! dsl_dataset_user_release_tmp(dp, dsobj, htag); } zap_cursor_fini(&zc); } /* * Create the pool-wide zap object for storing temporary snapshot holds. --- 834,872 ---- { zap_attribute_t za; zap_cursor_t zc; objset_t *mos = dp->dp_meta_objset; uint64_t zapobj = dp->dp_tmp_userrefs_obj; + nvlist_t *holds; if (zapobj == 0) return; ASSERT(spa_version(dp->dp_spa) >= SPA_VERSION_USERREFS); + holds = fnvlist_alloc(); + for (zap_cursor_init(&zc, mos, zapobj); zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { char *htag; uint64_t dsobj; + nvlist_t *tags; htag = strchr(za.za_name, '-'); *htag = '\0'; ++htag; ! if (nvlist_lookup_nvlist(holds, za.za_name, &tags) != 0) { ! tags = fnvlist_alloc(); ! fnvlist_add_boolean(tags, htag); ! fnvlist_add_nvlist(holds, za.za_name, tags); ! fnvlist_free(tags); ! } else { ! fnvlist_add_boolean(tags, htag); ! } } + dsl_dataset_user_release_tmp(dp, holds); + fnvlist_free(holds); zap_cursor_fini(&zc); } /* * Create the pool-wide zap object for storing temporary snapshot holds.