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author | Antoine Tenart <atenart@kernel.org> | 2022-07-07 10:02:45 +0200 |
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committer | Jakub Kicinski <kuba@kernel.org> | 2022-07-08 20:15:59 -0700 |
commit | 40ad0a52ef5d2c3379bb9b6af06c8029ac6c875d (patch) | |
tree | c180ec9f6df06a270fc514bded86b898e188ad8e /Documentation | |
parent | 5b47d2364652979dc43df14f7af19346a001b770 (diff) | |
download | linux-stable-40ad0a52ef5d2c3379bb9b6af06c8029ac6c875d.tar.gz linux-stable-40ad0a52ef5d2c3379bb9b6af06c8029ac6c875d.tar.bz2 linux-stable-40ad0a52ef5d2c3379bb9b6af06c8029ac6c875d.zip |
Documentation: add a description for net.core.high_order_alloc_disable
A description is missing for the net.core.high_order_alloc_disable
option in admin-guide/sysctl/net.rst ; add it. The above sysctl option
was introduced by commit ce27ec60648d ("net: add high_order_alloc_disable
sysctl/static key").
Thanks to Eric for running again the benchmark cited in the above
commit, showing this knob is now mostly of historical importance.
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220707080245.180525-1-atenart@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/admin-guide/sysctl/net.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst index fcd650bdbc7e..805f2281e000 100644 --- a/Documentation/admin-guide/sysctl/net.rst +++ b/Documentation/admin-guide/sysctl/net.rst @@ -391,6 +391,18 @@ GRO has decided not to coalesce, it is placed on a per-NAPI list. This list is then passed to the stack when the number of segments reaches the gro_normal_batch limit. +high_order_alloc_disable +------------------------ + +By default the allocator for page frags tries to use high order pages (order-3 +on x86). While the default behavior gives good results in most cases, some users +might have hit a contention in page allocations/freeing. This was especially +true on older kernels (< 5.14) when high-order pages were not stored on per-cpu +lists. This allows to opt-in for order-0 allocation instead but is now mostly of +historical importance. + +Default: 0 + 2. /proc/sys/net/unix - Parameters for Unix domain sockets ---------------------------------------------------------- |