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SubjectPPPoE Synchronous mode delivers very much packets errors
From
Date
Hi all.

I've tried today to enable the PPP Synchronous mode for my PPPoE
connection , and ifconfig reports a very strange thing:

melchior:/home/melchior# ifconfig
eth0 Link encap:Ethernet HWaddr 00:40:F4:55:A1:40
inet addr:192.168.254.1 Bcast:192.168.254.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:774 errors:0 dropped:0 overruns:0 frame:0
TX packets:579 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:362290 (353.7 KiB) TX bytes:51218 (50.0 KiB)
Interrupt:19 Base address:0x1f00

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:80 errors:0 dropped:0 overruns:0 frame:0
TX packets:80 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5128 (5.0 KiB) TX bytes:5128 (5.0 KiB)

ppp0 Link encap:Point-to-Point Protocol
inet addr:80.180.66.58 P-t-P:192.168.100.1
Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1
RX packets:189 errors:212 dropped:0 overruns:0 frame:0
TX packets:129 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:67413 (65.8 KiB) TX bytes:8740 (8.5 KiB)

melchior:/home/melchior#

Look at the ppp0 section , and look at the RX packets area , the
corrupted packages are MORE than the correct packages !! With async mode
this doesn't happen .
Someone have said me that It could be a kernel bug , is this possible?

During the connection I don't see any problem , all runs perfectly .

Thank you for your attention :

lsmod

Module Size Used by Not tainted
ppp_deflate 3448 0 (autoclean)
bsd_comp 4312 0 (autoclean)
ppp_synctty 6208 1 (autoclean)
zlib_inflate 18404 0 (autoclean) [ppp_deflate]
zlib_deflate 18008 0 (autoclean) [ppp_deflate]
af_packet 13352 2 (autoclean)
hdlc 1608 0 (unused)
syncppp 11120 0 [hdlc]
sunrpc 67840 0 (unused)
sr_mod 15704 0 (autoclean)
ext3 62980 3 (autoclean)
jbd 41716 3 (autoclean) [ext3]
serial 48228 0 (autoclean)
n_hdlc 6720 1
ide-cd 32096 0
cdrom 28672 0 [sr_mod ide-cd]
ppp_generic 17412 3 [ppp_deflate bsd_comp ppp_synctty]
slhc 5440 0 [ppp_generic]
hid 21572 0 (unused)
ehci-hcd 17260 0 (unused)
thermal 6308 0 (unused)
processor 8376 0 [thermal]
fan 1632 0 (unused)
button 2540 0 (unused)
agpgart 13808 0 (unused)
cmpci 31492 1
soundcore 3972 4 [cmpci]
evdev 4640 0 (unused)
mousedev 4180 1
sg 27644 0 (unused)
ide-scsi 10224 0
ch 12560 0 (unused)
scsi_mod 57108 4 [sr_mod sg ide-scsi ch]
ip_gre 9024 0 (unused)
8139too 14952 1
mii 2464 0 [8139too]
crc32 2880 0 [8139too]
keybdev 2084 0 (unused)
input 3520 0 [hid evdev mousedev keybdev]
usb-uhci 23280 0 (unused)
usbcore 40388 0 [hid ehci-hcd usb-uhci]
unix 15308 215 (autoclean)
melchior:/home/melchior#


lspci -vvv

melchior:/home/melchior# lspci -vvv
00:00.0 Host bridge: VIA Technologies, Inc. VT8377 [KT400 AGP] Host
Bridge
Subsystem: VIA Technologies, Inc.: Unknown device 0000
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
Latency: 8
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=256M]
Capabilities: [a0] AGP version 2.0
Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64-
HTrans- 64bit- FW+ AGP3- Rate=x1,x2,x4
Command: RQ=32 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit-
FW- Rate=<none>
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:01.0 PCI bridge: VIA Technologies, Inc. VT8235 PCI Bridge (prog-if 00
[Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: dde00000-dfefffff
Prefetchable memory behind bridge: d5c00000-ddcfffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 10)
Subsystem: Realtek Semiconductor Co., Ltd. RT8139
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 96 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 19
Region 0: I/O ports at ec00 [size=256]
Region 1: Memory at dfffff00 (32-bit, non-prefetchable)
[size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0c.0 Multimedia audio controller: C-Media Electronics Inc CM8738 (rev
10)
Subsystem: Micro-Star International Co., Ltd.: Unknown device
5900
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 96 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 16
Region 0: I/O ports at e800 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:10.0 USB Controller: VIA Technologies, Inc. USB (rev 80) (prog-if 00
[UHCI])
Subsystem: VIA Technologies, Inc. USB
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 96, cache line size 08
Interrupt: pin A routed to IRQ 21
Region 4: I/O ports at e400 [size=32]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) (prog-if
20 [EHCI])
Subsystem: VIA Technologies, Inc. USB 2.0
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 96, cache line size 10
Interrupt: pin D routed to IRQ 21
Region 0: Memory at dffffe00 (32-bit, non-prefetchable)
[size=256]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
Subsystem: VIA Technologies, Inc.: Unknown device 0000
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.1 IDE interface: VIA Technologies, Inc. VT82C586/B/686A/B PIPC Bus
Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
Subsystem: VIA Technologies, Inc. VT8235 Bus Master
ATA133/100/66/33 IDE Control: I/O+ Mem+ BusMaster+ SpecCycle-
MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 32
Interrupt: pin A routed to IRQ 255
Region 4: I/O ports at fc00 [size=16]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

01:00.0 VGA compatible controller: nVidia Corporation NV20 [GeForce3 Ti
200] (rev a3) (prog-if 00 [VGA])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 96 (1250ns min, 250ns max)
Interrupt: pin A routed to IRQ 16
Region 0: Memory at de000000 (32-bit, non-prefetchable)
[size=16M]
Region 1: Memory at d8000000 (32-bit, prefetchable) [size=64M]
Region 2: Memory at ddc80000 (32-bit, prefetchable) [size=512K]
Expansion ROM at dfef0000 [disabled] [size=64K]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [44] AGP version 2.0
Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA- ITACoh- GART64-
HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4
Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW-
Rate=<none>

melchior:/home/melchior#


Thank you

Marcello


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