Messages in this thread | | | From | "Nicholas R LeRoy" <> | Date | Thu, 14 Oct 1999 09:12:56 -0500 | Subject | Re: i486 can't keep up with 2.2.12 ? |
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> On Wed, 13 Oct 1999, Frank v Waveren wrote: > > > On Wed, Oct 13, 1999 at 08:48:01AM -0400, tenthumbs wrote: > > > I have an old i486 machine with a not quite so old Cyrix 5x86 cpu and > > > four IDE drives. (I have unmasked irq's on all drives so that's not an > > > issue.) Using a 2.2.12 kernel and pppd 2.3.9, there are a fairly large > > > number of packet errors. With just virtual consoles (no X) and just one > > > user program (fetchmail) running, ifconfig shows this: > > > > > > ppp0 Link encap:Point-to-Point Protocol > > > UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 > > > RX packets:4301 errors:12 dropped:0 overruns:0 frame:12 <--- > > > TX packets:4213 errors:0 dropped:0 overruns:0 carrier:0 > > > collisions:0 txqueuelen: > > > > > > Over a longer period of 64 minutes, ifconfig reported more frame errors > > > and "netstat -s" showed > > > > > > TcpExt: > > > 105 packets pruned from receive queue because of socket buffer > > > overrun > > > > > > which doesn't seem good. > > > > > > > > > None of this happens with a 2.0.38 kernel and pppd 2.2.0f. > > > > > > I can see that this might be due to a change in the disk code or in the > > > network code or in pppd. Does anyone have any ideas? > > > > > > Thanks. > > > > Have you tried setting the config option Cpu can't handle full bandwith? > > My old 386 dx/40 could handle alot more than one puny little ppp > connection. > > Stephen >
Jumping into the middle of the discussion -- I'm sure that one of you has thought of this already, but, just to make sure:
Is this running on a 16550 type UART or a 16450? The 16450 will almost certainly lose characters running at those speeds. No FIFO, just doesn't leave the CPU enough time to read the data out between interrupts.
Just my $.02 worth...
-Nick
-- +-------------------------------+--------------------------------------------+ | /`--_ Nicholas R LeRoy | In a world without fences, Who needs Gates?| |{ }/ Norland Corporation | ---- Experience Linux! ---- | | \ * / W6340 Hackbarth Rd | http://www.linux.org | http://www.ssc.com | | |___| Fort Atkinson, WI 53538 +--------------------------------------------+ | nick.leroy@norland.com | #include <disclaimer.h> | |http://www3.norland.com/~nleroy| These are my own ideas, not my employer's. | +----------------------------------------------------------------------------+
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