Hi I have been investigating a network problem that I have when connecting my phones to my laptop as an access point. The problem manifests as highly variable ping latencies (1ms to several seconds from AP to clients specifically) and frequent network stalls at random occasions rendering it unusable for certain applications. After investigation, I have found that it was due to incomplete implementation of AP mode for brcmsmac regarding power management: 1. TIM is not updated for beacons as needed and, thus, power-saving stations have no way to know about buffered traffic for them until they wake up for different reason. 2. Transmission of broadcast packets doesn't obey DTIM period: they are transmitted at any time. I was able to fix point 1 with probably inefficient and buggy patch that I shall submit and have no idea regarding point 2. Hope to see professional fixes, Thank you.
