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Jeff Gold wrote: > Mark Lord wrote: >> This can happen if there are kernel messages being printed on the >> serial console. >> If all is quiet, I would expect things to be as fast as normal >> elsewhere. > > Thank you for the suggestion. I don't see much in /var/log/messages > (syslogd is running). There are 3326 lines taking up about 256 kB > there, and when I run hdparm runs no further messages are generated. > > I don't have anything attached to the serial port at the moment. > Could that cause problems? I'm going to attach something and see what > happens. Other advice is still welcome. With nothing attached, any write to the serial device might go through a lengthy timeout because of flow control. I'd consider that a bug in this case though, and there is usually no console printout per scsi disk access either. I would not be surprised if your serial console causes a longer boot time, as all boot messages have to be transferred over the slow serial link or in the worst case timed out one message at a time. But I can't see why it'd make scsi disks slower. The scsi host adapter initialization writes some messages of course, but there should be no more console accesses during a hdparm test run. Helge Hafting - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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