[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Losing serial console boot output / sync_console
On 02/07/2011 21:04, "Andy Smith" <andy@xxxxxxxxxxxxxx> wrote: > Hello, > > About two months ago I sent this email to the Xen users lists > regarding a problem I was having losing some of my serial console > output on boot: > > http://lists.xensource.com/archives/html/xen-users/2011-04/msg00340.html If your serial line is very slow (I don't know why you're limited to 9600 baud -- 115200 baud at least is usually possible) and there is a lot of boot output then you can expect some of it to be discarded. We prefer to discard data rather than spin-wait to send it as that can indeed cause other time-critical services to be delayed too long. You should still get Xen output, for example if you CTRL-a three times and use the debug keys (try 'h' to get a list of them). If you want to capture all Xen's boot output, the safest way is to increase the serial transmit buffer size. Try adding serial_tx_buffer=64k to the Xen command line. -- Keir > Unfortunately it got no replies. > > I was just wondering and hoping if any developers could answer the > following questions: > > - Should I open a bug regarding the loss of serial console output on > boot, and; > > - Is sync_console as bad an idea as the warning suggests it is? > > I get all my serial console output if I use sync_console, but I > haven't really put the machines under heavy load and would rather > trade off truncated boot messages as opposed to performance under > load. > > Cheers, > Andy > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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