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Re: [Qemu-devel] [PATCH 1/7] usb: remove old usb-host code


From: Jan Kiszka
Subject: Re: [Qemu-devel] [PATCH 1/7] usb: remove old usb-host code
Date: Fri, 08 Nov 2013 17:51:17 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666

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



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