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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ea3b43b53dsm17649855ad.39.2026.10.21.19.30.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 19:30:49 -0700 (PDT) Message-ID: <0423c93c-8359-4fd5-9ba0-17e5ed3927dc@oss.qualcomm.com> Date: Thu, 22 Oct 2026 10:30:45 +0800 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 ath-next] wifi: ath12k: change MAC buffer ring size to 4096 To: Shawn Guo , Yingying Tang , linux-arm-msm@vger.kernel.org Cc: ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, yintang@qti.qualcomm.com References: <20260610031358.2043716-1-yingying.tang@oss.qualcomm.com> From: Baochen Qiang Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMDIyMDAwOSBTYWx0ZWRfXy2GGzJ0St060 Q8yutgHXA7KD7guNWoV/KUoAtRSK6ZvULrJUK6wdO1UgMBsRHKIwkdL4FfY1KcYJNBkJ0Mj1I3Y SM444Ctc1NvgebhgJIkR4Wmbzh5J23c= X-Authority-Analysis: v=2.4 cv=ReAFmFtv c=1 sm=1 tr=0 ts=6ad9755b cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=wP3v5rCdS2J_7y42CfQA:9 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-GUID: z7N-S4iDHozvdpeX4h_yXcGlrP9WC7Z3 X-Proofpoint-ORIG-GUID: z7N-S4iDHozvdpeX4h_yXcGlrP9WC7Z3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDIyMDAwOSBTYWx0ZWRfX+J+NRbPpsIg1 CKIvjX2mpjoxhoFaJBmRAk70xGHtU3rg5qTzH4o7mhVh/TTtZaoVgYsdHqV0GajlBPShsy6rbh8 Zu2tsx1VyLPkTP9xWD3SMd7y78fnhm9hN77BI7W2oIMKygltx81fRzvJEQl8GTLfdJoPR2/10xw fBF85zjtRcOJGnvCZ5pyfkvPmmqXuP7rAgE2SzAE4tca9xhbKKqfP8hfYuxrqfMyW8p/GRFkwot ZYn+NztweUgq1oU7cHh5KC9ZEi9R5STXGIVp4jbpC40H8blrCDN4g2FBEKmseMI3dntPlXtWN+x JoCesjiGxvKvBYu402nlZCq6PilvBHfSPP5UWHtAb1rA1KzJKeohgHwU0aN1y5sm0tyOkCGrQXn TWDgi9kqiXbdODx8XE2Svc67NDCq1O8zFVMjxSCievKRJJclRh+BInVaFkpcOySiXBqCtiRQq8E 0jweFoNsI0VoJPB0/kA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-22_01,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 suspectscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 clxscore=1015 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610220009 On 10/20/2026 4:53 PM, Shawn Guo wrote: > + linux-arm-msm > > On Tue, Jun 09, 2026 at 08:13:58PM -0700, Yingying Tang wrote: >> For WCN7850, MAC buffer ring size is updated to 2048 in >> 955df16f2a4c3 ("wifi: ath12k: change MAC buffer ring size to 2048") >> to increase peak throughput. >> >> But during the RX process, a phenomenon can still be observed where >> the throughput drops by about 30% from its peak value and then recovers, >> and this behavior repeats during RX. >> >> After increasing MAC buffer ring size to 4096, the data rate drop has >> gone. >> >> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3 >> >> Signed-off-by: Yingying Tang > > FYI, in case someone else runs into this: with this change (merged in > v7.3), WiFi on my Lenovo Yoga Slim 7x (X1E80100, WCN7850 hw2.0) stopped > working with the older firmware that Debian trixie still ships > (firmware-atheros 20250410-2): > > WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 > > Probe and firmware download succeed, but every WMI command times out > once the interface is brought up: > > ath12k_wifi7_pci 0004:01:00.0: wmi command 16387 timeout > ath12k_wifi7_pci 0004:01:00.0: failed to send WMI_PDEV_SET_PARAM cmd > ath12k_wifi7_pci 0004:01:00.0: failed to enable PMF QOS: -11 > ath12k_wifi7_pci 0004:01:00.0: fail to start mac operations in pdev idx 0 ret -11 > > Bisecting ath12k between v7.2 and v7.3 lands on this commit, and > reverting it on v7.3 brings WiFi back with the old firmware. > > Unmodified v7.3 works fine after updating to the current linux-firmware > image: > > WLAN.HMT.1.1.c7-00108-QCAHMTSWPL_V1.0_V2.0_SILICONZ_UPSTREAM-3 > > On Debian trixie that one is available from trixie-backports > (firmware-atheros 20260916-1~bpo13+1). > > So nothing needs fixing on the driver side. I'm just leaving this here > so that anyone who sees "wmi command ... timeout" on WCN7850 after a > kernel upgrade knows to update the firmware first. Hi Shawn, thanks for reporting this. I just had a quick test WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 with the latest ath tree (ath-202610191908), everything looks good, simple connection and ping pass, I don't see any ath12k warning. The firmware images I am using comes from the first commit adding WCN7850 firmware: fb04a7f4b750 ("ath12k: add new driver and firmware for WCN7850") and the md5 values are: linux-firmware/ath12k/WCN7850/hw2.0$ md5sum ./* d3750b67b1013fe82358d0538fb131b0 ./amss.bin c79c410d585360000c0490f16fda43e2 ./board-2.bin 73056f1d2aff886ce9bff313f455e963 ./m3.bin d0ee61498bf1a205147cdbcf645391e7 ./Notice.txt can you share the md5 values of your images? and have you ever tried the upstream mainline kernel or the latest ath.git tree?