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? --- diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index be95e55..af3e569 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -70,7 +70,7 @@ static unsigned int nr_uarts = CONFIG_SERIAL_8250_RUNTIME_UARTS; #define DEBUG_INTR(fmt...) do { } while (0) #endif -#define PASS_LIMIT 256 +#define PASS_LIMIT 65535 /* * We default to IRQ0 for the "no irq" hack. Some Best Regards. Yu ��.n��������+%������w��{.n�����o��^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�m