Date: Wed, 3 May 2000 16:52:27 +0500 From: "Sergey A. Ivanov" <lw@pd.chel.ru> To: Peter Jeremy <peter.jeremy@alcatel.com.au> Cc: freebsd-stable@FreeBSD.ORG Subject: Re[2]: sio interrupt handler problem Message-ID: <15703.000503@pd.chel.ru> In-Reply-To: <00Apr29.104753est.115205@border.alcanet.com.au> References: <00Apr29.104753est.115205@border.alcanet.com.au>
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Hello Peter,
Saturday, April 29, 2000, 5:47:49 AM, you wrote:
PJ> On Mon, Apr 24, 2000 at 05:34:37PM +1000, Sergey A. Ivanov wrote:
>> I have 4.0S installed on old 468dx66. Part of dmesg:
>>
>>sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
>>sio0: type 16450
PJ> [Gives SILO overflows at 38.4k]
PJ> I agree that 16450's are best avoided, but this should still work.
PJ> I can get 38.4k through a 16450 using pppd in 2.2.5 on a 386DX25
PJ> (though it won't do 57.6k). A 486dx66 has about 5 times the CPU
PJ> power, the overall system should be at least twice as fast. I don't
PJ> believe that 4.0S has more than doubled the interrupt overheads, so
PJ> there must be some other explanation.
PJ> What other related activity do you have? Are you loading the other
PJ> serial port or parallel port?
No. Single modem, no printers.
i'm changed MIO card (same sio type - no luck), patched kernel
(FIFO_RX_HIGH -> FIFO_RX_MEDL) - all just same. It works fine at
486dx33/IDE (now i have 486dx66/SCSI).
Best regards,
Sergey mailto:lw@pd.chel.ru
ICQ UIN: 49432691
http://lw.narod.ru
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