Re: mt76x0u. Unusable performance while compiling stuff.

[Stanislaw Gruszka <stf_xl@wp.pl>]

On Fri, Jan 03, 2020 at 03:30:18PM +0000, Daniel Similä wrote:
> Ok. I'm happy to test it. 
> But where do i download a patch or a complete tree?
> Sorry for my noobiness.

You can use 5.5-rcX kernel from kernel.org if your distribution
does not provide 5.5-rcX kernels already.

Patch can be downloaded from:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=284efb473ef5f02a7f2c13fdf8d516ecc589bdf1 

> fre 2020-01-03 klockan 13:18 +0100 skrev Stanislaw Gruszka:
> > (cc linux-wireless & Lorenzo)

Please do not drop CC , adding those back ...

Stanislaw


> > On Fri, Jan 03, 2020 at 12:19:20AM +0000, Daniel Similä wrote:
> > > Bus 001 Device 005: ID 148f:761a Ralink Technology, Corp. MT7610U ("Archer T2U" 2.4G+5G WLAN Adapter
> > > 
> > > Driver is mt76x0u
> > > Wifi is 5GHz ~260Mb
> > > 
> > > while doing:
> > > nice make -j16 
> > > 
> > > Pinging my router goes from:
> > > ping _gateway
> > > PING _gateway (192.168.0.1) 56(84) bytes of data.
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=1 ttl=64 time=1.20 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=2 ttl=64 time=1.02 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=3 ttl=64 time=2.12 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=4 ttl=64 time=1.32 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=5 ttl=64 time=2.04 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=6 ttl=64 time=1.31 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=7 ttl=64 time=1.71 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=8 ttl=64 time=0.903 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=9 ttl=64 time=1.00 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=10 ttl=64 time=1.42 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=11 ttl=64 time=1.15 ms
> > > 
> > > to unusable:
> > > 
> > > ping _gateway
> > > PING _gateway (192.168.0.1) 56(84) bytes of data.
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=1 ttl=64 time=167 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=3 ttl=64 time=306 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=4 ttl=64 time=255 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=6 ttl=64 time=253 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=8 ttl=64 time=84.7 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=9 ttl=64 time=522 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=10 ttl=64 time=211 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=11 ttl=64 time=304 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=15 ttl=64 time=2825 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=16 ttl=64 time=1812 ms
> > > 64 bytes from _gateway (192.168.0.1): icmp_seq=17 ttl=64 time=799 ms
> > > 
> > > Running kernel 5.4.6-arch3-1
> > > CPU is Amd 2700X and ram is 16GB
> > 
> > I think this should be fixed by 5.5 commit:
> > 
> > commit 284efb473ef5f02a7f2c13fdf8d516ecc589bdf1
> > Author: Lorenzo Bianconi <lorenzo@kernel.org>
> > Date:   Mon Oct 28 17:38:05 2019 +0100
> > 
> >     mt76: mt76u: rely on a dedicated stats workqueue
> > 
> > and if it indeed fixes the problem, this commit should be requested
> > to stable.
> > 
> > Stanislaw
>