Adam,

i can't quite agree with those arguments - as i mentioned we have customers running tens of 6981 card in the same Linux system with PCIe back-planes - no problems, i.e. if that issue was driver performance problem alone it will be quite obvious in such configuration. also, even i haven't seen that OSS driver i bet it implements partially the Linux DVB API, e.g. things like "get_frontend" ioctl and such are missing and not implemented. so, pretty much those missing things from full API implementation do the same, i.e. dummy or empty functions and result in the same - lower the transaction load on the device and that by no any mean exclude TVH - i mean it doesn't prove TVH can work with let's say driver that have full "get_frontend" ioctl implementation and transaction load due to that and not missing or dummy one. also, if TVH wasn't involved then VDR, DVBlast, etc will suffer from the same issue. last, but not least i'm interested for which other Dual DVB-S2 cards you're talking, because the other one that came in mind are using Montage chips for which the Linux drivers are made by me too. so, it's not that simple to state TBS drivers are at fault, especially when no other application except TVH with the same transactions from the driver side can create the problem.

best regards, konstantin

 Rob, have you tested with those changes below -they lower the transaction speed to PCIe bridge 'cx23885' and are not part of the mainline Linux kernel driver for 'cx23885', which could be another reason that can explain what Adam reported in his last email.

thanks, konstantin