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Re: [Qemu-devel] [PATCH 06/22] ehci: Speed up the timer of raising int f


From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH 06/22] ehci: Speed up the timer of raising int from the async schedule
Date: Mon, 15 Oct 2012 13:17:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.8) Gecko/20121012 Thunderbird/10.0.8

On 10/15/12 12:38, Hans de Goede wrote:
> Often the guest will queue up new packets in response to a packet, in the
> async schedule with its IOC flag set, completing. By speeding up the
> frame-timer, we notice these new packets earlier. This increases the
> speed (MB/s) of a Linux guest reading from a USB mass storage device by a
> factor of 1.15 on top of the "Improve latency of interrupt delivery"
> speed-ups, both with and without input pipelining enabled.

Why not just set async_stepdown to 0?

cheers,
  Gerd




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