![]() ![]() Seems to be related to the 2.6.24 kernel: This card worked in Feisty/Gutsy on this computer, but not in Hardy. notice that you don't receive any packets at all ![]() notice that ifconfig lists the interfaceģ. TX packets:47 errors:0 dropped:0 overruns:0 carrier:0 RX packets:1267 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:63 overruns:0 carrier:0Įth0 Link encap:Ethernet HWaddr 00:1B:FC:9D:72:9F RX packets:0 errors:0 dropped:0 overruns:0 frame:0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR+ Įth0 Link encap:Ethernet HWaddr 00:1b:fc:9d:72:9f Unknown device Ĭontrol: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01) When it stops the wired network is reported as connected but there are all zeros (IP address, gateway, etc.) I booted from Gutsy CD and the NIC worked correctly.Ġ1:00.0 Ethernet controller : Realtek Semiconductor Co., Ltd. After starting the computer, icon of the NetworkManager is animated. My NIC RTL8111/8168B does not receive an IP address. The final check after re-enabling interrupts is to avoid a race condition between an event arriving and re-enabling interrupts.Ubuntu Hardy final release. (If there are items to process in this last check, it re-disables interrupts and starts over from the beginning.) The idea is that until the secondary interrupt handler has finished processing, there really is no point triggering the primary interrupt handler, and a waste of resources, if additional events arrive, because the driver is already busy processing the event queue. Then it enables interrupts again, checks once more if there's any work pending from the device and if there are none, it terminates. The OS eventually runs the secondary handler, which processes whatever information the device has provided, until it runs out of things to do. If so, it disables interrupts on the device, and schedules the driver's secondary interrupt handler to run. ![]() The driver's primary interrupt handler checks the device registers if the driver needs to do any processing. The most common scenario is that an event happens on the device, so an interrupt is generated. On-device - This is usually an optimisation to avoid interrupting the CPU when it doesn't need to be interrupted.In some OSes, the PCI(e) level is actually handled for you when you activate PCI device interrupts via higher-level APIs. This may also be affected by power management events. PCI/PCIe configuration - It's my understanding this is mainly about routing interrupts, and is something you normally do once when your driver loads (or is activated by a client) and again when your driver unloads (or is deactivated). ![]() Secondary interrupt handlers are really just callbacks on a regular OS thread which doesn't have any of the restrictions of a primary interrupt handler. Do as much of your interrupt handling in secondary interrupt handlers as possible to avoid such situations. Handling interrupts promptly is generally a good thing, so you want to absolutely minimise such sections in any code you write. Interrupt handlers must not acquire normal locks (by definition they can't be suspended), and they must not attempt to acquire a spin-lock that is held by the thread currently scheduled on the same CPU (because that thread is blocked from progressing by the very same interrupt handler!) so ensuring data safety with interrupt handlers can be tricky. In particular, if state/memory corruption could occur during a particular section of code if the CPU happened to be interrupted, then that section of code will need to disable interrupt handling. In the OS (really, this means in the CPU) - This is generally about avoiding race conditions.Disabling interrupts at the various levels usually has completely different purposes. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |