Re: [Xen-devel] serial8250: too much work for irq4

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Markus Armbruster writes ("[Xen-devel] serial8250: too much work for irq4"):
> Wild guess: Unlike a real UART, the virtual UART empties as quickly as
> the kernel can stuff in bytes.  So, while the kernel has bytes to stuff,
> it doesn't get around to doing much else.

This is certainly true and would explain the message you see.

Are there any other adverse symptoms ?  In principle it would be
possible to add a rate limit but it seems poor to artificially
rate-limit a virtual device to the wall-clock speed of the physical
object.

Ian.

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