Re: Poor USB performance on ASUS 520 motherboard (no IRQ?)

[Daniel O'Connor via freebsd-usb]

> On 4 Dec 2021, at 05:11, Hans Petter Selasky <h...@selasky.org> wrote:
> On 11/24/21 23:33, Daniel O'Connor wrote:
>> I found that the Gigabyte GA-A320M-H one works fine but the ASUS A520M-A/CSM 
>> one is significantly slower for tests where there are many back and forth 
>> messages (streaming data seems fine).
> 
> There is a register in the XHCI PCI area, to set the IRQ latency. You may 
> want to check the PCI IDs towards Linux if these chips require some kind of 
> special quirks.

Thanks, I had a look at the Linux code (searched via lxr.linux.no) but couldn't 
find any mention of that product ID (0x43ec).

There are several other AMD related quirks but I don't think any of them impact 
this.

I wonder if the BIOS sets them differently and FreeBSD never changes it (I 
haven't tried Linux).

How can I change it?

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum