https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254333
--- Comment #37 from commit-h...@freebsd.org --- A commit in branch stable/12 references this bug: URL: https://cgit.FreeBSD.org/src/commit/?id=54beb1ef2c831394ef908ef52bac690a4fe362e0 commit 54beb1ef2c831394ef908ef52bac690a4fe362e0 Author: Richard Scheffenegger <rsch...@freebsd.org> AuthorDate: 2021-03-28 21:12:03 +0000 Commit: Richard Scheffenegger <rsch...@freebsd.org> CommitDate: 2021-04-16 20:51:57 +0000 tcp: reduce memory footprint when listing tcp hostcache In tcp_hostcache_list, the sbuf used would need a large (~2MB) blocking allocation of memory (M_WAITOK), when listing a full hostcache. This may stall the requestor for an indeterminate time. A further optimization is to return the expected userspace buffersize right away, rather than preparing the output of each current entry of the hostcase, provided by: @tuexen. This makes use of the ready-made functions of sbuf to work with sysctl, and repeatedly drain the much smaller buffer. PR: 254333 MFC after: 2 weeks Reviewed By: #transport, tuexen Sponsored by: NetApp, Inc. Differential Revision: https://reviews.freebsd.org/D29471 (cherry picked from commit cb0dd7e122b8936ad61a141e65ef8ef874bfebe5) sys/netinet/tcp_hostcache.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) -- You are receiving this mail because: You are on the CC list for the bug. _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
