I've been having some issues with the AC 7265 card seemingly having throughput/connectivity issues. I've reference the document AC-7265 Frequent disconnects/Painfully slow when connected and changed most of those settings. I currently have configured:
U-APSD Support - Disabled
Transmit Power - Highest
Preferred Band - 5.2Ghz
Wireless Mode - 802.11a/b/g
HT Mode - VHT
Ad Hoc QOS Mode - WMM Disabled
I've also configured the PC to not be allowed to turn of the network adapter to save power in the device manager.
My wireless network has really good 5Ghz and 2.4Ghz coverage with 20Mhz channels only. I'm also running the latest driver for AC-7265 (188.8.131.52). The scenario I came across today:
- The card was connected on the 5Ghz frequency.
- The laptop was connected for roughly 23 hours straight to the same AP.
- The client was connected with very good signal strength of -63 RSSI with a SNR of 29 on AP1. I observed really high latency and lots of ping drops from my machine to the cart. I also observed that during a speed test there would be significant throughput drop that corresponded with the ping drops. I did not see any issues that would indicate any sort of wireless layer 2 issue. Whenever I tried to send any sort of significant data through the wireless cart is when I would start seeing the ping latency jump and ping packets not respond.
- The client roamed to another access point AP2 where it connected with a better signal of -45 RSSI with a SNR of 46 (also on the 5 Ghz). I experienced the same exact same performance issues that I observed while connected to AP1. Lots of ping drops and poor throughput when trying to send any data.
- I tried to adjust a setting on the wireless card settings and that reset the wireless connection on the cart. I am no longer experiencing the performance issues I was seeing for the past 3 hours while connected to the same AP2. My speed tests are almost 3 times faster after the WiFi card was reset by changing the setting. Would changing the 2.4Ghz channel width from "auto" to "20Mhz" cause the network card driver to reload? I changed this setting back to auto and I'm still seeing the much better performance.
- There was no interference on the 5Ghz spectrum during this time.
The fact that I witnessed this poor performance behavior on 2 seperate AP would lead me to believe that there is potentially an issue with the driver. Has anyone seen this type of behavior with these cards? Any input would be helpful. I believe we are experiencing this on a lot of laptops.