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Re: [Xen-devel] serial8250: too much work for irq4
| To: | Markus Armbruster <armbru@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] serial8250: too much work for irq4 |
| From: | Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> |
| Date: | Wed, 18 Feb 2009 11:08:57 +0000 |
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| Delivery-date: | Wed, 18 Feb 2009 03:09:27 -0800 |
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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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