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SubjectPROBLEM: Alpha SMP Low Outbound Bandwidth
From
Date
[1.] One line summary of the problem:
Kernel 2.4.4 ac15
Tested with several cards and pieces of software, the outbound bandwidth
on a quad cpu alpha is 2 megabytes a second or less on a 100 mbit
switched ethernet network. Other machines on same switch do 10 or more
megabytes per second. Switch is DLink 3624, 24 port, only 12 ports in
use.

[2.] Full description of the problem/report:
Using a quad 400Mhz Dodge/Rawhide machine with Tulip or VIARhine cards,
on wuFTP, the outbound bandwidth tops out at 2 megabytes per second and
the inbound at 6 megabytes per second. Also noticeable are apparent
slowdowns or console lockups/sluggishness during the transfer.

[3.] Keywords (i.e., modules, networking, kernel):
networking, alpha, tulip, via_rhine

[4.] Kernel version (from /proc/version):
Linux version 2.4.4-ac15 (root@lister) (gcc version 2.96 20000731 (SuSE
Linux 7.1/Alpha)) #1 SMP Thu May 24 18:41:13 PDT 2001
[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)

[6.] A small shell script or example program which triggers the
problem (if possible)

Problem machine:
ncftp /tmp > put foo
foo: 34.38 MB 5.16
MB/s
ncftp /tmp > get -z foo baz
baz: 34.38 MB 1.16
MB/s
other machine on same switch to same ftp server.
ncftp /home/jay > get foo
foo: 34.38 MB 10.12
MB/s
ncftp /home/jay > put -z foo baz
foo: 34.38 MB 9.93
MB/s
[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)

Linux lister 2.4.4-ac15 #1 SMP Thu May 24 18:41:13 PDT 2001 alpha
unknown

Gnu C 2.96
Gnu make 3.79.1
binutils 2.10.0.33
util-linux 2.10q
mount 2.10q
modutils 2.4.2
e2fsprogs 1.19
pcmcia-cs 3.1.22
PPP 2.4.0
isdn4k-utils 3.1pre1a
Linux C Library so.6.1
Dynamic linker (ldd) 2.2
Procps 2.0.7
Net-tools 1.57
Kbd 1.02
Sh-utils 2.0
Modules Loaded tulip via-rhine

[7.2.] Processor information (from /proc/cpuinfo):
lister:/usr/src/linux # cat /proc/cpuinfo
cpu : Alpha
cpu model : EV56
cpu variation : 7
cpu revision : 0
cpu serial number :
system type : Rawhide
system variation : Dodge
system revision : 0
system serial number : NI70904KB0
cycle frequency [Hz] : 400000000
timer frequency [Hz] : 1200.00
page size [bytes] : 8192
phys. address bits : 40
max. addr. space # : 127
BogoMIPS : 738.12
kernel unaligned acc : 1646246
(pc=fffffc000042a3d8,va=fffffc005d9b784e)
user unaligned acc : 0 (pc=0,va=0)
platform string : AlphaServer 4100 5/400 4MB
cpus detected : 4
cpus active : 4
cpu active mask : 000000000000000f
[7.3.] Module information (from /proc/modules):
lister:/usr/src/linux # cat /proc/modules
tulip 59296 1
via-rhine 16464 0 (autoclean)

[7.4.] Loaded driver and hardware information (/proc/ioports,
/proc/iomem)
lister:/usr/src/linux # cat /proc/ioports
00000000-0000ffff : PCI IO bus 0
00000000-0000001f : dma1
00000020-0000003f : pic1
00000040-0000005f : timer
00000060-0000006f : keyboard
00000070-00000080 : rtc
00000070-0000007f : rtc
000000a0-000000bf : pic2
000000c0-000000df : dma2
000002f8-000002ff : serial(auto)
000003f8-000003ff : serial(auto)
00008000-000080ff : VIA Technologies, Inc. Ethernet Controller
00008000-000080ff : via-rhine
00008400-0000847f : Digital Equipment Corporation DECchip 21140
[FasterNet]
00008400-0000847f : tulip
200000000-20000ffff : PCI IO bus 1
200008000-2000080ff : Symbios Logic Inc. (formerly NCR) 53c810
200008000-20000807f : ncr53c8xx
200009000-2000090fe : qlogicisp
lister:/usr/src/linux # cat /proc/iomem
00000000-ffffffff : PCI mem bus 0
00000000-07ffffff : HAE0
02200000-0223ffff : Digital Equipment Corporation DECchip 21140
[FasterNet]
02240000-0224ffff : S3 Inc. 86c764/765 [Trio32/64/64V+]
02250000-0225ffff : VIA Technologies, Inc. Ethernet Controller
02260000-022600ff : VIA Technologies, Inc. Ethernet Controller
02260000-022600ff : via-rhine
02261000-0226107f : Digital Equipment Corporation DECchip 21140
[FasterNet]
02261000-0226107f : tulip
200000000-2ffffffff : PCI mem bus 1
200000000-207ffffff : HAE0
202200000-2022000ff : Symbios Logic Inc. (formerly NCR) 53c810
[7.5.] PCI information ('lspci -vvv' as root)
lister:/usr/src/linux # lspci -vvv
00:01.0 Non-VGA unclassified device: Intel Corporation 82375EB (rev 05)
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 ? routed to IRQ 32

00:02.0 VGA compatible controller: S3 Inc. 86c764/765 [Trio32/64/64V+]
(rev 54) (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-
Interrupt: pin A routed to IRQ 16
Region 0: Memory at 000000000c000000 (32-bit, non-prefetchable)
Expansion ROM at 0000000002240000 [size=64K]
00:03.0 Ethernet controller: Digital Equipment Corporation DECchip 21140
[FasterNet] (rev 22)
Subsystem: Digital Equipment Corporation: Unknown device 500a
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 (5000ns min, 10000ns max), cache line size 10
Interrupt: pin A routed to IRQ 20
Region 0: I/O ports at 8400 [size=128]
Region 1: Memory at 0000000002261000 (32-bit, non-prefetchable)
[size=128]
Expansion ROM at 0000000002200000 [disabled] [size=256K]
00:05.0 Ethernet controller: VIA Technologies, Inc. Ethernet Controller
(rev 42)
Subsystem: D-Link System Inc: Unknown device 1400
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 (750ns min, 2000ns max), cache line size 10
Interrupt: pin A routed to IRQ 28
Region 0: I/O ports at 8000 [size=256]
Region 1: Memory at 0000000002260000 (32-bit, non-prefetchable)
[size=256]
Expansion ROM at 0000000002250000 [disabled] [size=64K]
Capabilities: [40] 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-
01:01.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR)
53c810 (rev 02)
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 56
Region 0: I/O ports at 200008000 [size=256]
Region 1: Memory at 0000000202200000 (32-bit, non-prefetchable)
[size=256]
01:02.0 PCI bridge: Digital Equipment Corporation DECchip 21050 (rev 02)
(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: 32, cache line size 10
Bus: primary=01, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 00009000-00009fff
Memory behind bridge: 02300000-023fffff
Prefetchable memory behind bridge: 00100000-000fffff
BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
02:00.0 SCSI storage controller: Q Logic ISP1020 (rev 02)
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, cache line size 10
Interrupt: pin A routed to IRQ 40
Region 0: I/O ports at 200009000 [size=256]
Region 1: Memory at 0000000202310000 (32-bit, non-prefetchable)
[size=4K]
Expansion ROM at 0000000202300000 [disabled] [size=64K]
[7.6.] SCSI information (from /proc/scsi/scsi)
lister:/usr/src/linux # cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: DEC Model: RZ1CB-CS (C) DEC Rev: 0844
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: DEC Model: RZ1CB-CA (C) DEC Rev: LYJ0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: DEC Model: RZ1CB-CA (C) DEC Rev: LYJ0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: DEC Model: RZ1CB-CA (C) DEC Rev: LYJ0
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 05 Lun: 00
Vendor: DEC Model: RRD45 (C) DEC Rev: 0436
Type: CD-ROM ANSI SCSI revision: 02

[7.7.] Other information that might be relevant to the problem
(please look in /proc and include all information that you
think to be relevant):

There is a tcpdump available. 4.6 megabytes for anyone who wants it.



[X.] Other notes, patches, fixes, workarounds:

During one of the slowdowns, the console appeared to lock up. holding
down the ALT key seemed to make it wake up.




--
--
Jay Thorne Manager, Systems & Technology, UserFriendly Media, Inc.

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