On Sat 2008-01-12 21:24:57, Alan Cox wrote: > On Sat, 12 Jan 2008 15:15:43 -0500 > Benjamin LaHaise <bcrl@xxxxxxxxx> wrote: > > > When using kvm with a serial console, the serial driver will print out > > "too much work for irq4" on any heavy activity (ie vi on a file repainting > > the terminal). This message is entirely spurious, as output continues to > > work fine. Remove the message as it corrupts screen output and is far too > > easy to trigger. > > NAK. This is a qemu/kvm emulation bug. The real check is there to catched > jammed IRQs and combined with the IRQ bug handling nowdays does actually > do the intended job. > > Our serial port code (correctly) interprets a continuous stream of bytes > at an impossible bit rate as an error. KVM should be emulating to some > extent at least the timing on serial interfaces or using a virtualised > interface. How can you tell apart impossible bit rate from really slow CPU, or maybe just an SMI storm, or heavy busmaster DMA? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
