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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
[Qemu-devel] [PATCH 02/22] uhci: Move checks to continue queuing to uhci_fill_queue(), Hans de Goede, 2012/10/15
[Qemu-devel] [PATCH 04/22] ehci: Set int flag on a short input packet, Hans de Goede, 2012/10/15
[Qemu-devel] [PATCH 07/22] ehci: Detect going in circles when filling the queue, Hans de Goede, 2012/10/15
[Qemu-devel] [PATCH 08/22] xhci: Add a xhci_ep_nuke_one_xfer helper function, Hans de Goede, 2012/10/15
[Qemu-devel] [PATCH 05/22] ehci: Improve latency of interrupt delivery and async schedule scanning, Hans de Goede, 2012/10/15
[Qemu-devel] [PATCH 10/22] usb: Add USB_RET_ADD_TO_QUEUE packet result code, Hans de Goede, 2012/10/15