[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-discuss] IRQ per CPU

From: Dongli Zhang
Subject: Re: [Qemu-discuss] IRQ per CPU
Date: Thu, 5 Jul 2018 15:16:44 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

On 07/05/2018 12:12 PM, Probir Roy wrote:
>> Does 'per CPU basis' indicates irq per cpu, or irq per device queue?
> IRQ per CPU core, meaning that IRQ will be raised at and served by
> that CPU. Does IRQ per queue mean the same thing?

About 'IRQ per queue', the device may create multiple queue in the OS driver.
The number of queues are always proportional to the number of CPU core/thread
(although this is also always configurable by OS driver).

Usually the per-queue irq/vector is bound to each CPU. As the number of
queue/irq is always the same as the number of CPU, it is sort of 'per CPU
basis', as each CPU will be serving irq for its own queue.

Dongli Zhang

reply via email to

[Prev in Thread] Current Thread [Next in Thread]