[Qemu-devel] Re: [PATCH] char: Flush read buffer in mux_chr_can_read

[Jan Kiszka <jan.kiszka@web.de>]

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Alexander Graf wrote:
> On 14.05.2010, at 18:17, Jan Kiszka wrote:
>> Alexander Graf wrote:
>>> 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?
> 
> Nope, it works fine with an x86 guest. I put the following in /etc/inittab of my guest:
> 
> 11:2345:respawn:/sbin/mingetty --noclear /dev/hvc0 linux
> 
> One major thing to keep in mind when talking about s390 guests is that we almost never trap into userspace.

Do you have the same problem when using an unbuffered backend, e.g. pty?
Maybe that single-byte "fifo" of stdio makes the difference, though I
wonder why only on s390 (guest exists should not block the polling done
by the io-thread, just accelerate it).

Jan


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