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[Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read |
Date: |
Fri, 14 May 2010 18:17:18 +0200 |
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 |
Alexander Graf wrote:
> On 12.05.2010, at 20:51, Jan Kiszka wrote:
>
>> Alexander Graf wrote:
>>> Jan Kiszka wrote:
>>>> Alexander Graf wrote:
>>>>
>>>>> Jan Kiszka wrote:
>>>>>
>>>>>> Move the buffer flush from mux_chr_read to mux_chr_can_read. While the
>>>>>> latter is called periodically, the former will only be invoked when new
>>>>>> characters arrive at the back-end. This caused problems to front-end
>>>>>> drivers whenever they were unable to read data immediately, e.g.
>>>>>> virtio-console attached to stdio.
>>>>>>
>>>>>>
>>>>> I don't see this patch applied, but also don't see any issues with
>>>>> virtio-console anymore on today's git. Odd.
>>>>>
>>>>>
>>>> Hmm, I had a clear before-after experience using virtio console with an
>>>> x86 Linux guest. I still think my patch is correct and required. Maybe
>>>> you can bisect this positive "regression"? Something might paper over
>>>> the core issue now.
>>>>
>>> I just did a git reset --hard on
>>> baf0b55a9e57b909b1f8b0f732c0b10242867418 and it worked! What the ...
>> Whatever "worked" now means (I'm slightly confused), I just rechecked
>> the situation over current git head ("qemu linux-guest.img -chardev
>> stdio,id=cons,mux=on -device virtio-serial -device
>> virtconsole,chardev=cons -mon chardev=cons", "cat /dev/hvc0" in the
>> guest, typing some chars on the host console): The problem still
>> persists, my patch still solves it. Can you confirm this, ideally also
>> for s390?
>
> Now that I can finally reproduce the bug with --enable-io-thread, I can
> verify that it does *not* fix the issue.
I do not trust your tests. :p
I just tried to reproduce with --enable-io-thread and the setup I
described above - all still fine here. Can you reproduce with an x86 guest?
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [PATCH] [RESEND] Make char muxer more robust wrt small FIFOs, (continued)
- Re: [Qemu-devel] [PATCH] [RESEND] Make char muxer more robust wrt small FIFOs, Jan Kiszka, 2010/05/04
- [Qemu-devel] Re: [PATCH] [RESEND] Make char muxer more robust wrt small FIFOs, Jan Kiszka, 2010/05/05
- [Qemu-devel] Re: [PATCH] [RESEND] Make char muxer more robust wrt small FIFOs, Jan Kiszka, 2010/05/05
- [Qemu-devel] Re: [PATCH] [RESEND] Make char muxer more robust wrt small FIFOs, Alexander Graf, 2010/05/05
- [Qemu-devel] [PATCH] char: Flush read buffer in mux_chr_can_read, Jan Kiszka, 2010/05/05
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Alexander Graf, 2010/05/11
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Jan Kiszka, 2010/05/11
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Alexander Graf, 2010/05/11
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Jan Kiszka, 2010/05/12
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Alexander Graf, 2010/05/14
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read,
Jan Kiszka <=
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Alexander Graf, 2010/05/15
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Jan Kiszka, 2010/05/15
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Alexander Graf, 2010/05/15
- [Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read, Jan Kiszka, 2010/05/15