>>> On 06.03.12 at 18:20, Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx> wrote: > -> the usage of XenbusStateInitWait? Why do we introduce that? Looks > like a fix to something. No, this is required to get the negotiation working (the frontend must not try to read the new nodes until it can be certain that the backend populated them). However, as already pointed out in an earlier reply to Santosh, the way this is done here doesn't appear to allow for the backend to already be in InitWait state when the frontend gets invoked. > -> XENBUS_MAX_RING_PAGES - why 2? Why not 4? What is the optimal > default size for SSD usage? 16? What do SSDs have to do with a XenBus definition? Imo it's wrong (and unnecessary) to introduce a limit at the XenBus level at all - each driver can do this for itself. As to the limit for SSDs in the block interface - I don't think the number of possibly simultaneous requests has anything to do with this. Instead, I'd expect the request number/size/segments extension that NetBSD apparently implements to possibly have an effect. Jan -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
