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Hi I have this simple but very annoying problem with the serial buffer since upgrading from 9.0 to 9.3: The machine (arcom gx1, National Semi Geode 300MHz, 40 GB, 128 MB) is used to talk to an acquisition instrument through RS232. The link is speed is 115200 bauds, with hardware flow control turned on. During a bulk dump (256kBytes) from instrument to hard disk, the computer's UART (16550A) will overflows typically 2 or 3 times, even though computer remains idle. So who is doing the damage? The HDD throughput already at max with hdparm, and permits other IRQs to be serviced during disk access, so that the UART doesn't get locked out. The UART config is handled by a program that remains unchanged sine 9.0 and has proved to work well. Could it be that the kernel is too slow at servicing IRQs from the UART? Granted, the machine is slow by nowadays standard, but it used to work perfectly well before 9.3. no reference to this problem in the suse support db. Can someone help? Any suggestion welcome. Francois ------------------------------------------------------------------- This e-mail and any attachments may contain confidential and/or privileged material; it is for the intended addressee(s) only. If you are not a named addressee, you must not use, retain or disclose such information. NPL Management Ltd cannot guarantee that the e-mail or any attachments are free from viruses. NPL Management Ltd. Registered in England and Wales. No: 2937881 Registered Office: Serco House, 16 Bartley Wood Business Park, Hook, Hampshire, United Kingdom RG27 9UY -------------------------------------------------------------------
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Francois Maletras