Hello, I'm part of a team working on a BSP for a board with a WILC1000 module from Microchip (connected via SDIO interface). Currently we are having issues when transferring large files over a WiFi connection. Here is our steps to reproduce: # generating file to transfer dd if=/dev/random of=./test_300mb_file bs=1M count=300 # transferring a file from a linux laptop to the test board scp test_300mb_file user@192.168.1.25:~/ During transmission, the connection speed drops to almost zero and returns to usual values after a while. At the moment of the drop, we see the following messages in the kernel log: ------------------------------------ [ 138.016229] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 140.001682] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 140.009719] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 142.003636] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 142.011670] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 144.006676] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 144.014709] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 146.007049] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 146.015082] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 156.123890] mmc0: Timeout waiting for hardware interrupt. [ 156.129318] mmc0: sdhci: ============ SDHCI REGISTER DUMP =========== [ 156.135764] mmc0: sdhci: Sys addr: 0x4cef1400 | Version: 0x00000002 [ 156.142211] mmc0: sdhci: Blk size: 0x00000170 | Blk cnt: 0x00000001 [ 156.148655] mmc0: sdhci: Argument: 0x14000170 | Trn mode: 0x00000013 [ 156.155102] mmc0: sdhci: Present: 0x01d88a0a | Host ctl: 0x00000013 [ 156.161547] mmc0: sdhci: Power: 0x00000002 | Blk gap: 0x00000080 [ 156.167992] mmc0: sdhci: Wake-up: 0x00000008 | Clock: 0x0000003f [ 156.174438] mmc0: sdhci: Timeout: 0x0000008f | Int stat: 0x00000000 [ 156.180883] mmc0: sdhci: Int enab: 0x107f100b | Sig enab: 0x107f100b [ 156.187330] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000502 [ 156.193776] mmc0: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000b407 [ 156.200223] mmc0: sdhci: Cmd: 0x0000353a | Max curr: 0x00ffffff [ 156.206669] mmc0: sdhci: Resp[0]: 0x00001000 | Resp[1]: 0x00000000 [ 156.213113] mmc0: sdhci: Resp[2]: 0x00000000 | Resp[3]: 0x00000000 [ 156.219557] mmc0: sdhci: Host ctl2: 0x00000000 [ 156.224005] mmc0: sdhci: ADMA Err: 0x00000007 | ADMA Ptr: 0x40881200 [ 156.230450] mmc0: sdhci-esdhc-imx: ========= ESDHC IMX DEBUG STATUS DUMP ========= [ 156.238024] mmc0: sdhci-esdhc-imx: cmd debug status: 0x3100 [ 156.243687] mmc0: sdhci-esdhc-imx: data debug status: 0x3200 [ 156.249438] mmc0: sdhci-esdhc-imx: trans debug status: 0x3300 [ 156.255276] mmc0: sdhci-esdhc-imx: dma debug status: 0x3400 [ 156.260938] mmc0: sdhci-esdhc-imx: adma debug status: 0x35b4 [ 156.266690] mmc0: sdhci-esdhc-imx: fifo debug status: 0x3610 [ 156.272439] mmc0: sdhci-esdhc-imx: async fifo debug status: 0x3751 [ 156.278710] mmc0: sdhci: ============================================ [ 156.287352] wilc1000_sdio mmc0:0001:1: wilc_sdio_cmd53..failed, err(-110) [ 156.294177] wilc1000_sdio mmc0:0001:1: Failed cmd53 [0], bytes read... ------------------------------------ We are using kernel 5.15 and the problem reproduces after a 5-15 seconds of each file transfer. For a testing purposes we compiled v6.9-rc5 and with a newer kernel the issue only occurs from time to time. About 3 out of 10 transfers show the same errors in the kernel log. In addition: - We do not think this issue is related to the FW used in the WILC1000. We tested different versions (including the latest from the official FW repository) and all showed the same results; - We tried turning off Power Saving mode, but it doesn't change anything. Are you aware of this issue? Do you have ideas/tips how to debug/solve this issue? Best regards, Kirill
