1*06f45fe9SJuergen GrossWhat: /sys/devices/*/xenbus/event_channels 2*06f45fe9SJuergen GrossDate: February 2021 3*06f45fe9SJuergen GrossContact: Xen Developers mailing list <xen-devel@lists.xenproject.org> 4*06f45fe9SJuergen GrossDescription: 5*06f45fe9SJuergen Gross Number of Xen event channels associated with a kernel based 6*06f45fe9SJuergen Gross paravirtualized device frontend or backend. 7*06f45fe9SJuergen Gross 8*06f45fe9SJuergen GrossWhat: /sys/devices/*/xenbus/events 9*06f45fe9SJuergen GrossDate: February 2021 10*06f45fe9SJuergen GrossContact: Xen Developers mailing list <xen-devel@lists.xenproject.org> 11*06f45fe9SJuergen GrossDescription: 12*06f45fe9SJuergen Gross Total number of Xen events received for a Xen pv device 13*06f45fe9SJuergen Gross frontend or backend. 14*06f45fe9SJuergen Gross 15*06f45fe9SJuergen GrossWhat: /sys/devices/*/xenbus/jiffies_eoi_delayed 16*06f45fe9SJuergen GrossDate: February 2021 17*06f45fe9SJuergen GrossContact: Xen Developers mailing list <xen-devel@lists.xenproject.org> 18*06f45fe9SJuergen GrossDescription: 19*06f45fe9SJuergen Gross Summed up time in jiffies the EOI of an interrupt for a Xen 20*06f45fe9SJuergen Gross pv device has been delayed in order to avoid stalls due to 21*06f45fe9SJuergen Gross event storms. This value rising is a first sign for a rogue 22*06f45fe9SJuergen Gross other end of the pv device. 23*06f45fe9SJuergen Gross 24*06f45fe9SJuergen GrossWhat: /sys/devices/*/xenbus/spurious_events 25*06f45fe9SJuergen GrossDate: February 2021 26*06f45fe9SJuergen GrossContact: Xen Developers mailing list <xen-devel@lists.xenproject.org> 27*06f45fe9SJuergen GrossDescription: 28*06f45fe9SJuergen Gross Number of events received for a Xen pv device which did not 29*06f45fe9SJuergen Gross require any action. Too many spurious events in a row will 30*06f45fe9SJuergen Gross trigger delayed EOI processing. 31*06f45fe9SJuergen Gross 32*06f45fe9SJuergen GrossWhat: /sys/devices/*/xenbus/spurious_threshold 33*06f45fe9SJuergen GrossDate: February 2021 34*06f45fe9SJuergen GrossContact: Xen Developers mailing list <xen-devel@lists.xenproject.org> 35*06f45fe9SJuergen GrossDescription: 36*06f45fe9SJuergen Gross Controls the tolerated number of subsequent spurious events 37*06f45fe9SJuergen Gross before delayed EOI processing is triggered for a Xen pv 38*06f45fe9SJuergen Gross device. Default is 1. This can be modified in case the other 39*06f45fe9SJuergen Gross end of the pv device is issuing spurious events on a regular 40*06f45fe9SJuergen Gross basis and is known not to be malicious on purpose. Raising 41*06f45fe9SJuergen Gross the value for such cases can improve pv device performance. 42