From: Menglong Dong <imagedong@xxxxxxxxxxx> 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@xxxxxxxxxxx> --- Documentation/networking/ip-sysctl.rst | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index d91ab28718d4..8edc1547170b 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -1012,13 +1012,11 @@ 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. -- 2.27.0
