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It's now possible for sbcompress() to compact mbuf clusters, so do it.

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This helps prevent mbuf cluster exhaustion when receiving lots of small
packets.
This commit is contained in:
mycroft 1999-08-04 21:30:12 +00:00
parent 439a6c4942
commit 545d8679c0
1 changed files with 6 additions and 4 deletions
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10
sys/kern/uipc_socket2.c
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@ -1,4 +1,4 @@
/* $NetBSD: uipc_socket2.c,v 1.30 1999/07/01 08:12:47 itojun Exp $ */ /* $NetBSD: uipc_socket2.c,v 1.31 1999/08/04 21:30:12 mycroft Exp $ */
/* /*
* Copyright (c) 1982, 1986, 1988, 1990, 1993 * Copyright (c) 1982, 1986, 1988, 1990, 1993
@ -676,9 +676,11 @@ sbcompress(sb, m, n)
m = m_free(m); m = m_free(m);
continue; continue;
} }
if (n && (n->m_flags & (M_EXT | M_EOR)) == 0 && if (n && (n->m_flags & M_EOR) == 0 && n->m_type == m->m_type &&
(n->m_data + n->m_len + m->m_len) < &n->m_dat[MLEN] && (((n->m_flags & M_EXT) == 0 &&
n->m_type == m->m_type) { n->m_data + n->m_len + m->m_len < &n->m_dat[MLEN]) ||
((~n->m_flags & (M_EXT|M_CLUSTER)) == 0 &&
n->m_data + n->m_len + m->m_len < &n->m_ext.ext_buf[MCLBYTES]))) {
memcpy(mtod(n, caddr_t) + n->m_len, mtod(m, caddr_t), memcpy(mtod(n, caddr_t) + n->m_len, mtod(m, caddr_t),
(unsigned)m->m_len); (unsigned)m->m_len);
n->m_len += m->m_len; n->m_len += m->m_len;