From: Jan Kiszka <jan.kiszka@siemens.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 1/7] usb: remove old usb-host code
Date: Fri, 08 Nov 2013 17:51:17 +0100 [thread overview]
Message-ID: <527D1685.8020503@siemens.com> (raw)
In-Reply-To: <1383925171.4350.3.camel@nilsson.home.kraxel.org>
On 2013-11-08 16:39, Gerd Hoffmann wrote:
> Hi,
>
>> OK, then here is the first issue I ran into while trying libusbx (git
>> head, i.e. 1.0.17+: The new stack causes significant latency issues that
>> makes it almost unusable for pass-through of USB audio devices (some
>> headset in my case). Reverting usb-linux and disabling libusb over QEMU
>> git head makes things work again. I'll have to stick with this for now
>> as it is affecting my work environment.
>>
>> Any spontaneous ideas how to analyse or even resolve this?
>
> Try setting isobsize property to something smaller than 32 (which is the
> default).
OK, isobsize=2 and isobufs=32 helped, possibly other combinations as
well - but not just reducing isobsize or increasing isobufs. Any theory
about this? How can we find better defaults?
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2013-11-08 16:51 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-19 9:34 [Qemu-devel] [PULL 0/7] usb patch queue Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 1/7] usb: remove old usb-host code Gerd Hoffmann
2013-10-02 13:14 ` Jan Kiszka
2013-10-07 7:16 ` Gerd Hoffmann
2013-10-09 10:55 ` Jan Kiszka
2013-10-09 11:42 ` Gerd Hoffmann
2013-11-08 14:00 ` Jan Kiszka
2013-11-08 15:39 ` Gerd Hoffmann
2013-11-08 16:51 ` Jan Kiszka [this message]
2013-11-11 8:47 ` Gerd Hoffmann
2013-11-11 19:28 ` Hans de Goede
2013-09-19 9:34 ` [Qemu-devel] [PATCH 2/7] xhci: Fix number of streams allocated when using streams Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 3/7] xhci: Init a transfers xhci, slotid and epid member on epctx alloc Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 4/7] xhci: Add xhci_epid_to_usbep helper function Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 5/7] xhci: Fix memory leak on xhci_disable_ep Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 6/7] usb: Also reset max_packet_size on ep_reset Gerd Hoffmann
2013-09-19 9:34 ` [Qemu-devel] [PATCH 7/7] usb: Fix iovec memleak on combined-packet free Gerd Hoffmann
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