Re: [PATCH] xhci: Cope with VIA VL805 readahead

2017-10-12 Thread Hao Wei Tee
On 11/10/2017 02:09, Robin Murphy wrote: > The VIA VL805 host controller is well-known for causing problems on > systems with IOMMUs enabled, ranging from triggering endless streams of > fault messages to locking itself up completely. It appears that the root > of the problem might be an

Re: [PATCH] xhci: Cope with VIA VL805 readahead

2017-10-12 Thread Mathias Nyman
On 11.10.2017 18:46, David Laight wrote: From: Mathias Nyman Sent: 11 October 2017 15:41 .. If possible I'd like to try and find some other solution before chopping the Segment size to smaller than 256. I think that your first proposal of adding the guard page to the segment pool could be

RE: [PATCH] xhci: Cope with VIA VL805 readahead

2017-10-11 Thread David Laight
From: Mathias Nyman > Sent: 11 October 2017 15:41 .. > If possible I'd like to try and find some other solution before chopping the > Segment > size to smaller than 256. > I think that your first proposal of adding the guard page to the segment pool > could be an option. Would be a waste of a

Re: [PATCH] xhci: Cope with VIA VL805 readahead

2017-10-11 Thread Mathias Nyman
On 10.10.2017 21:09, Robin Murphy wrote: The VIA VL805 host controller is well-known for causing problems on systems with IOMMUs enabled, ranging from triggering endless streams of fault messages to locking itself up completely. It appears that the root of the problem might be an over-aggressive

RE: [PATCH] xhci: Cope with VIA VL805 readahead

2017-10-11 Thread David Laight
From: Robin Murphy > Sent: 10 October 2017 19:09 > > The VIA VL805 host controller is well-known for causing problems on > systems with IOMMUs enabled, ranging from triggering endless streams of > fault messages to locking itself up completely. It appears that the root > of the problem might be