Re: Poor USB performance on ASUS 520 motherboard (no IRQ?)
Date: Thu, 25 Nov 2021 03:49:18 UTC
> On 24 Nov 2021, at 17:24, Daniel O'Connor <darius@dons.net.au> wrote: > I've tried updating the BIOS and tested FreeBSD 12 (same as the Gigabyte) and FreeBSD 13 with no change. > > One thing I did notice is this dmesg output: > xhci0: <XHCI (generic) USB 3.0 controller> mem 0xfcfa0000-0xfcfa7fff at device 0.0 on pci1 > xhci0: 32 bytes context size, 64-bit DMAxhci1: <XHCI (generic) USB 3.0 controller > ... > xhci1: <XHCI (generic) USB 3.0 controller> mem 0xfcb00000-0xfcbfffff at device 0.3 on pci7 > xhci1: 64 bytes context size, 64-bit DMA > .. > xhci2: <XHCI (generic) USB 3.0 controller> mem 0xfca00000-0xfcafffff at device 0.4 on pci7 > xhci2: 64 bytes context size, 64-bit DMA It seems this is a bit of a red herring as vmstat -i does show it getting IRQs, not sure why they don't show up in dmesg though. Some discussion on IRC suggests it is because the system has no legacy PCI IRQs. However on the system in question the IRQ rate tops out at 1kHz and on the other it is 8kHz which I think explains my problem. I'm going to have a look for BIOS settings today but getting a bit desperate for ideas.. -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum