Date: Fri, 8 Jan 2021 18:44:12 GMT
From: Andrew Gallatin <gallatin@FreeBSD.org>
To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Subject: git: 52cd25eb1aa7 - main - mbuf: enable ext_pgs ("unmapped") mbufs by default
Message-ID: <202101081844.108IiCHg070535@gitrepo.freebsd.org>
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The branch main has been updated by gallatin: URL: https://cgit.FreeBSD.org/src/commit/?id=52cd25eb1aa75a28f6d3c3eb4757242c1f55d6cc commit 52cd25eb1aa75a28f6d3c3eb4757242c1f55d6cc Author: Andrew Gallatin <gallatin@FreeBSD.org> AuthorDate: 2021-01-08 18:18:42 +0000 Commit: Andrew Gallatin <gallatin@FreeBSD.org> CommitDate: 2021-01-08 18:43:30 +0000 mbuf: enable ext_pgs ("unmapped") mbufs by default Ext_pg mbufs allow carrying multiple pages per mbuf. This reduces mbuf linked list traversals, especially in socket buffers, thereby reducing cache misses and CPU use for applications using sendfile. Note that ext_pages use unmapped pages, eliminating KVA mapping costs on 32-bit platforms. Ext_pg mbufs are also required for ktls (KERN_TLS), and having them disabled by default is a stumbling block for those wishing to enable ktls. Reviewed-by: jhb, glebius Sponsored by: Netfix --- sys/kern/kern_mbuf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/kern/kern_mbuf.c b/sys/kern/kern_mbuf.c index 84e068424427..a46c576bad90 100644 --- a/sys/kern/kern_mbuf.c +++ b/sys/kern/kern_mbuf.c @@ -116,7 +116,7 @@ int nmbjumbop; /* limits number of page size jumbo clusters */ int nmbjumbo9; /* limits number of 9k jumbo clusters */ int nmbjumbo16; /* limits number of 16k jumbo clusters */ -bool mb_use_ext_pgs; /* use M_EXTPG mbufs for sendfile & TLS */ +bool mb_use_ext_pgs = true; /* use M_EXTPG mbufs for sendfile & TLS */ SYSCTL_BOOL(_kern_ipc, OID_AUTO, mb_use_ext_pgs, CTLFLAG_RWTUN, &mb_use_ext_pgs, 0, "Use unmapped mbufs for sendfile(2) and TLS offload");
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