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authorZh-yuan Ye <ye.zh-yuan@socionext.com>2020-03-24 17:28:25 +0900
committerDavid S. Miller <davem@davemloft.net>2020-03-24 16:14:05 -0700
commit961d0e5b32946703125964f9f5b6321d60f4d706 (patch)
treefcb396f0cf79c5b519fd171879e67ce09393eabf /include
parent81573b18f26defe672a7d960f9af9ac2c97f324d (diff)
net: cbs: Fix software cbs to consider packet sending time
Currently the software CBS does not consider the packet sending time when depleting the credits. It caused the throughput to be Idleslope[kbps] * (Port transmit rate[kbps] / |Sendslope[kbps]|) where Idleslope * (Port transmit rate / (Idleslope + |Sendslope|)) = Idleslope is expected. In order to fix the issue above, this patch takes the time when the packet sending completes into account by moving the anchor time variable "last" ahead to the send completion time upon transmission and adding wait when the next dequeue request comes before the send completion time of the previous packet. changelog: V2->V3: - remove unnecessary whitespace cleanup - add the checks if port_rate is 0 before division V1->V2: - combine variable "send_completed" into "last" - add the comment for estimate of the packet sending Fixes: 585d763af09c ("net/sched: Introduce Credit Based Shaper (CBS) qdisc") Signed-off-by: Zh-yuan Ye <ye.zh-yuan@socionext.com> Reviewed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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