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    SubjectPROBLEM: Alpha SMP Low Outbound Bandwidth
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    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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