> -----Original Message----- > From: Christian Ehrhardt [mailto:ehrhardt@xxxxxxxxxxxxxxxxxx] > Sent: Wednesday, August 13, 2008 8:47 PM > To: Liu Yu > Cc: kvm-ppc@xxxxxxxxxxxxxxx > Subject: Re: Serial stdio overwhelming interrupts > > Liu Yu wrote: > > Hi guys, > > > > In my kvm machine, I use serial as its default stdio. > > But when display a number of characters, e.g. cat a big ascii file, > > the serial always hangs as encount overwhelming interrupts, > and then output a kernel log "serial8250: too much work for irq 42". > > > > I found that the serial in qemu is primitive so that it > generate a interrupt on every single character. > > This make it easier to reach the threshold of reporting > "too much work". > > > > I had to use the patch below to get this issue walked arroud. > > > > Have you guys ever met the serial hanging problem before? > > > > We had that some times in the beginning while we brought up > interrupts. > But since that time it did never occur again and I thought we > fixed it. > Maybe your use case of catting a file to it is stressing it > now to a new extend triggering it again. > I found this. http://www.archivum.info/qemu-devel@xxxxxxxxxx/2008-02/msg00169.html I don’t know how it is going now. Because I still work on the branch kvm-70rc1 of qemu Maybe it has been solved. ��.n��������+%������w��{.n�����o��^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�m
