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Fri, 30 Oct 2026 11:47:05 -0700 (PDT) Received: from [192.168.1.50] ([81.196.40.70]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e71b959c1sm4606853f8f.45.2026.10.30.11.47.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 30 Oct 2026 11:47:04 -0700 (PDT) Message-ID: <716e083d-93c1-4236-bfa2-ec88d0c84ca4@gmail.com> Date: Fri, 30 Oct 2026 20:47:03 +0200 X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH rtw-next 0/5] wifi: rtw88: pci: Support an older design, like RTL8821AE/RTL8812AE To: Ping-Ke Shih , "linux-wireless@vger.kernel.org" References: <2033f1b1-fb12-4a04-aef4-923590e64463@gmail.com> <4c0eae7568334475b3b9a57e50f5c912@realtek.com> <152bc5bf-4e5e-443e-b191-198205ad81bc@gmail.com> <08b040fc2f7e4311aa7721cf4969896f@realtek.com> Content-Language: en-US From: Bitterblue Smith In-Reply-To: <08b040fc2f7e4311aa7721cf4969896f@realtek.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 30/10/2026 02:43, Ping-Ke Shih wrote: > Bitterblue Smith wrote: >>>>>> >>>>>> It uses RX descriptor number 511, then number 0, then it doesn't >>>>>> want to use number 1 for "a while". It raises IMR_RDU once or twice, >>>>>> and only then it moves on to number 1, 2... >>>>>> >>>>>> Usually when it raises IMR_RDU there are 510 or 511 RX descriptors >>>>>> available (out of 512), so it has no excuse. >>>>>> >>>>>> Once it has raised IMR_RDU the RX speed doesn't exceed 70-100 Mbps >>>>>> anymore. >>>>> >>>>> If driver can receive packets on time, how does it raise ISR_RDU? >>>> >>>> It's a mystery for me. >>>> >>>>> Is RX interrupt triggered on time? >>>>> >>>> >>>> I'm not sure how to check this. I assume it is triggered on time because >>>> the ring was always nearly empty when it raised IMR_RDU. >>> >>> If interrupt handler can handle (ignore) "empty" RX ring , it might be harmless >>> to see raised IMR_RDU, right? >> >> It is harmless in the sense that everything keeps working, just the RX >> speed is low. > > Have you dug the cause RX speed is low? The PHY rate becomes low at that time? > Or can air capture see any weird packets? Or did you think PCIE get stuck > somehow? I think it's a PCIE problem. Before the first IMR_RDU the RX speed is normal. After, it's low. I will test the RTL8821AE again probably next week.