Date: Wed, 8 Jun 2016 11:24:01 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r301601 - projects/vnet/sys/netinet Message-ID: <201606081124.u58BO1IH092140@repo.freebsd.org>
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Author: bz Date: Wed Jun 8 11:24:01 2016 New Revision: 301601 URL: https://svnweb.freebsd.org/changeset/base/301601 Log: Replace the DELAY with a more sophisticated check to make sure the inps are all gone before doing the cleanup. We might decide to do a partial cleanup before polling, but for now bail on the safe side. Also use pause instead of DELAY [1]. Suggested by: rwatson [1] Sponsored by: The FreeBSD Foundation Modified: projects/vnet/sys/netinet/tcp_subr.c Modified: projects/vnet/sys/netinet/tcp_subr.c ============================================================================== --- projects/vnet/sys/netinet/tcp_subr.c Wed Jun 8 11:18:49 2016 (r301600) +++ projects/vnet/sys/netinet/tcp_subr.c Wed Jun 8 11:24:01 2016 (r301601) @@ -731,18 +731,19 @@ tcp_init(void) static void tcp_destroy(void *unused __unused) { - int error; + int error, n; /* * All our processes are gone, all our sockets should be cleaned * up, which means, we should be past the tcp_discardcb() calls. - * Sleep to let all tcpcb timers really disappear and then cleanup. - * Timewait will cleanup its queue and will be ready to go. - * XXX-BZ In theory a few ticks should be good enough to make sure - * the timers are all really gone. We should see if we could use a - * better metric here and, e.g., check a tcbcb count as an optimization? + * Sleep to let all tcpcb timers really disappear and cleanup. */ - DELAY(1000000 / hz); + do { + pause("tcpdes", hz/10); + INP_LIST_RLOCK(&V_tcbinfo); + n = V_tcbinfo.ipi_count; + INP_LIST_RUNLOCK(&V_tcbinfo); + } while (n != 0); tcp_hc_destroy(); syncache_destroy(); tcp_tw_destroy();
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