Hi, I did a couple of tests. 1. test Kernel modules from distribution (kvm-72) & new user space application (qemu-system-x86_64 - patched kvm-88) It seems that it is not working Possibilities: 1) ru is not ready because of other reason than switching to suspended state 2) patch is not working well 3) anything else ;-) Conclusion: net card emulation is placed in kernel module, so the test was good for nothing ;-) 2. test Kernel modules and user space application from patched kvm-88 It seems, it works well, but 1) RNR interrupt is not generated 2) processing is significantly slower (with kvm from my distro I had a speed (till suspending and restarting ru unit) round 6000 kB/s now it is round 1000 kB/s My conclusion is that there is another change in i82577b emulation which solved the problem for me - probably some race condition in rx descriptor processing disappeared. Or, due to lower transfer speed (see above), processing of rx descripors is done in time, so a descriptor with "S bit" is never processed. Do you have another idea? I'll do other stress tests during the night and send you the results. I'll try kvm-88 without the patch too. Thank you for your time. Michal Filka > > Stefan Weil schrieb: > > Jan Kiszka schrieb: > >> Michal Filka wrote: > >>> Hi, > >>> > >>> I have question on i82557b emulation in kvm. > >>> > >>> I have run a proprietary operating system (Pharlap OS) in kvm. Part > >>> of the job has been porting driver for i8255x. During the job I > >>> discovered that kvm's emulation doesn't support a RNR interrupt (it > >>> is disabled in the code). > >>> > >>> Why is it disabled? I'm running heavily loaded application and I have > >>> to poll descriptor list instead of waiting for RNR interrupt. > >> Best asked on qemu-devel, CC'ing the developer of this device model. > >> > >> Jan > >> > > > > Hi, > > > > up to now, nobody complained about the missing RNR interrupts. > > Linux obviously works without them, so I had no reason to > > implement them. > > > > The disabled code parts (function eepro100_rnr_interrupt) > > can be enabled, but you still need code which calls them > > at the right places. > > > > This should not be very difficult if there is some test case > > which proves the working RNR interrupt. > > > > Regards > > Stefan > > > > Hi Michal, > > could you please try the appended patch and tell me whether it works? > > Regards > Stefan > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
