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| author |   Menglong Dong <imagedong@tencent.com> | 2021-11-05 15:35:41 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-11-05 10:42:46 +0000 |
| commit | 69dfccbc1186f7091f97b70a9437d6a51313834d (patch) | |
| tree | 09a052cfde87926b839489c57405cb5521a1c671 /Documentation/networking | |
| parent | net: ethernet: litex: Remove unnecessary print function dev_err() (diff) | |
| download | linux-dev-69dfccbc1186f7091f97b70a9437d6a51313834d.tar.xz linux-dev-69dfccbc1186f7091f97b70a9437d6a51313834d.zip | |
net: udp: correct the document for udp_mem
udp_mem is a vector of 3 INTEGERs, which is used to limit the number of
pages allowed for queueing by all UDP sockets.
However, sk_has_memory_pressure() in __sk_mem_raise_allocated() always
return false for udp, as memory pressure is not supported by udp, which
means that __sk_mem_raise_allocated() will fail once pages allocated
for udp socket exceeds udp_mem[0].
Therefor, udp_mem[0] is the only one that limit the number of pages.
However, the document of udp_mem just express that udp_mem[2] is the
limitation. So, just fix it.
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.rst | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index c61cc0219f4c..c04431144f7a 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -1004,13 +1004,11 @@ udp_l3mdev_accept - BOOLEAN udp_mem - vector of 3 INTEGERs: min, pressure, max Number of pages allowed for queueing by all UDP sockets. - min: Below this number of pages UDP is not bothered about its - memory appetite. When amount of memory allocated by UDP exceeds - this number, UDP starts to moderate memory usage. + min: Number of pages allowed for queueing by all UDP sockets. pressure: This value was introduced to follow format of tcp_mem. - max: Number of pages allowed for queueing by all UDP sockets. + max: This value was introduced to follow format of tcp_mem. Default is calculated at boot time from amount of available memory. |