On 15.03.2013 13:53, Gleb Smirnoff wrote:
Author: glebius
Date: Fri Mar 15 12:53:53 2013
New Revision: 248323
URL: http://svnweb.freebsd.org/changeset/base/248323
Log:
- Use m_getcl() instead of hand allocating.
Sponsored by: Nginx, Inc.
Modified:
head/sys/netinet/tcp_output.c
Modified: head/sys/netinet/tcp_output.c
==============================================================================
--- head/sys/netinet/tcp_output.c Fri Mar 15 12:52:59 2013
(r248322)
+++ head/sys/netinet/tcp_output.c Fri Mar 15 12:53:53 2013
(r248323)
@@ -842,23 +842,19 @@ send:
TCPSTAT_INC(tcps_sndpack);
TCPSTAT_ADD(tcps_sndbyte, len);
}
- MGETHDR(m, M_NOWAIT, MT_DATA);
+#ifdef INET6
+ if (MHLEN < hdrlen + max_linkhdr)
+ m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
+ else
+#endif
+ m = m_gethdr(M_NOWAIT, MT_DATA);
+
m = m_getm2(hdrlen + max_linkhdr, M_NOWAIT, MT_DATA, M_PKTHDR);
would be even more compact. Since max_linkhdr could be large as well,
the possibility of a cluster applies to IPv4 too.
--
Andre
if (m == NULL) {
SOCKBUF_UNLOCK(&so->so_snd);
error = ENOBUFS;
goto out;
}
-#ifdef INET6
- if (MHLEN < hdrlen + max_linkhdr) {
- MCLGET(m, M_NOWAIT);
- if ((m->m_flags & M_EXT) == 0) {
- SOCKBUF_UNLOCK(&so->so_snd);
- m_freem(m);
- error = ENOBUFS;
- goto out;
- }
- }
-#endif
+
m->m_data += max_linkhdr;
m->m_len = hdrlen;
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