Re: silo overflows -- what can I do about this?

[Joseph Garcia <bsd_usr@xxxxxxxxx>]

Matthew Dillon wrote:
> :Okay, so I was working via the console port (i.e. DFly box connected to 
> :  Firewall via serial port) of my PIX firewall and I kept getting these 
> :errors. These errors made it quite impossible to configure the firewall 
> :because I was unable to recieve the output from the PIX device.
> :
> :Error Messages (/var/log/messages):
> :Oct 17 17:40:04 dfly kernel: sio1: 2 more silo overflows (total 23)
> :Oct 17 17:40:06 dfly kernel: sio1: 4 more silo overflows (total 27)
> :Oct 17 17:41:22 dfly kernel: sio1: 7 more silo overflows (total 34)
> :Oct 17 17:41:24 dfly kernel: sio1: 9 more silo overflows (total 43)
> :Oct 17 17:41:25 dfly kernel: sio1: 4 more silo overflows (total 47)
> :Oct 17 17:41:38 dfly kernel: sio1: 2 more silo overflows (total 49)
> :Oct 17 17:49:36 dfly kernel: sio1: 1 more silo overflow (total 50)
> :Oct 17 17:49:53 dfly kernel: sio1: 1 more silo overflow (total 51)
> :Oct 17 17:49:57 dfly kernel: sio1: 1 more silo overflow (total 52)
> :Oct 17 17:50:02 dfly kernel: sio1: 1 more silo overflow (total 53)
> :
> :Is there anything I can do about these errors? The man page for sio says 
> :that it's an interupt problem. Any help would be appreciated.
> :
> :Thanks!
> :
> :Joey
>
>     It may be possible to reduce the instances of the problem
>     by using a different fifo trigger point, but there is always
>     going to be an issue of some sort, especially if the IRQ
>     used by the serial port is shared with another device. 
>
>     Try changing FIFO_RX_MEDH to FIFO_RX_LOW around line 2281
>     of /usr/src/sys/dev/serial/sio/sio.c.
>
>     Also post your 'dmesg' output.
>
> 					-Matt
> 					Matthew Dillon 
> 					<dillon@xxxxxxxxxxxxx>

If I change that line in that file, do I only need to recompile the kernel?

Here's the dmesg output:

Copyright (c) 2003, 2004, 2005, 2006 The DragonFly Project.
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
	The Regents of the University of California. All rights reserved.
DragonFly 1.6.1-RELEASE #2: Tue Sep 19 16:08:22 PDT 2006
    bear@xxxxxxxxxxxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/GENERIC
TSC clock: 866340703 Hz, i8254 clock: 1193202 Hz
CPU: Intel Pentium III (866.33-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x686  Stepping = 6

Features=0x387f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,PN,MMX,FXSR,SSE>
real memory  = 536805376 (524224K bytes) avail memory = 508997632 
(497068K bytes) Preloaded elf kernel "/kernel" at 0xc073c000.
Preloaded elf module "/modules/vesa.ko" at 0xc073c1e8.
Preloaded elf module "/modules/acpi.ko" at 0xc073c290.
Pentium Pro MTRR support enabled
md0: Malloc disk
pcibios: BIOS version 2.10
Using $PIR table, 6 entries at 0xc00fdce0
npx0: <math processor> on motherboard
npx0: INT 16 interface
Using MMX optimized bcopy/copyin/copyout
acpi0: <VT694X AWRDACPI> on motherboard
acpi0: Power Button (fixed)
Warning: ACPI is disabling APM's device.  You can't run both
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
cpu0: <ACPI CPU (3 Cx states)> on acpi0
acpi_button0: <Power Button> on acpi0
compare 0
legacypci0 on motherboard
pcib0: <Host to PCI bridge> on legacypci0
pci0: <PCI bus> on pcib0
agp0: <VIA 82C691 (Apollo Pro) host to PCI bridge> mem 
0xe0000000-0xe3ffffff at device 0.0 on pci0
pcib1: <VIA 82C598MVP (Apollo MVP3) PCI-PCI (AGP) bridge> at device 1.0 
on pci0
pci1: <PCI bus> on pcib1
pci1: <ATI model 5046 graphics accelerator> at 0.0 irq 11
isab0: <VIA 82C686 PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 82C686 ATA66 controller> port 0x6400-0x640f at device 7.1 
on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <VIA 83C572 USB controller> port 0x6800-0x681f irq 10 at device 
7.2 on pci0
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhub0: port error, restarting port 1
uhub0: port error, giving up port 1
uhci1: <VIA 83C572 USB controller> port 0x6c00-0x6c1f irq 10 at device 
7.3 on pci0
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhub1: port error, restarting port 1
uhub1: port error, giving up port 1
pci0: <VIA 82C686 AC97 Audio> at 7.5 irq 5
sym0: <875> port 0x7c00-0x7cff mem 
0xec122000-0xec122fff,0xec121000-0xec1210ff irq 10 at device 9.0 on pci0
sym0: No NVRAM, ID 7, Fast-20, SE, parity checking
sym1: <875> port 0x8000-0x80ff mem 
0xec125000-0xec125fff,0xec124000-0xec1240ff irq 5 at device 10.0 on pci0
sym1: No NVRAM, ID 7, Fast-20, SE, parity checking
fxp0: <Intel 82550 Pro/100 Ethernet> port 0x8400-0x843f mem 
0xec100000-0xec11ffff,0xec120000-0xec120fff irq 9 at device 11.0 on pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: MAC address: 00:02:b3:2d:aa:8f
fxp1: <Intel 82559 Pro/100 Ethernet> port 0x8800-0x883f mem 
0xec000000-0xec0fffff,0xec123000-0xec123fff irq 11 at device 12.0 on pci0
miibus1: <MII bus> on fxp1
inphy1: <i82555 10/100 media interface> on miibus1
inphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp1: MAC address: 00:d0:b7:25:f9:b8
orm0: <Option ROMs> at iomem 
0xc0000-0xcafff,0xcb000-0xcc7ff,0xcd000-0xce7ff,0xcf000-0xd2fff on isa0 
pmtimer0 on isa0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0 kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300> sio0 at port 0x3f8-0x3ff irq 
4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
acpi_cpu: throttling enabled, 2 steps (100% to 50.0%), currently 100.0%
ad0: 19092MB <WDC WD200EB-11BHF0> [38792/16/63] at ata0-master UDMA66
acd0: DVD-ROM <DVD-ROM DDU1621> at ata1-master PIO4 Waiting 5 seconds 
for SCSI devices to settle Mounting root from ufs:/dev/ad0s1a cd0 at 
ata1 bus 0 target 0 lun 0
cd0: <SONY DVD-ROM DDU1621 S3.3> Removable CD-ROM SCSI-0 device
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present 
da0 at sym1 bus 0 target 1 lun 0
da0: <COMPAQ ST34371W 0682> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing 
Enabled
da0: 4094MB (8386000 512 byte sectors: 255H 63S/T 522C)
sio1: 1 more silo overflow (total 1)
sio1: 4 more silo overflows (total 5)
sio1: 6 more silo overflows (total 11)
sio1: 1 more silo overflow (total 12)
sio1: 3 more silo overflows (total 15)
sio1: 2 more silo overflows (total 17)
sio1: 1 more silo overflow (total 18)
sio1: 1 more silo overflow (total 19)
sio1: 1 more silo overflow (total 20)
sio1: 1 more silo overflow (total 21)
sio1: 2 more silo overflows (total 23)
sio1: 4 more silo overflows (total 27)
sio1: 7 more silo overflows (total 34)
sio1: 9 more silo overflows (total 43)
sio1: 4 more silo overflows (total 47)
sio1: 2 more silo overflows (total 49)
sio1: 1 more silo overflow (total 50)
sio1: 1 more silo overflow (total 51)
sio1: 1 more silo overflow (total 52)
sio1: 1 more silo overflow (total 53)