[Prism54-users] Throughput problem w/ SMC 2802W v2

[Eetu Rantanen]

Hi all,

I'm experiencing a problem with the throughput with SMC 2802w, with 2.6.7
vanilla kernel. 

When starting to transfer files for example with ftp, a process called
kdldrd/dpc starts consuming a lot of CPU-time:

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
1259 root       0 -20     0    0    0 S 36.8  0.0   4:45.68 kdldrd/dpc

1884 eran      15   0  4648 2572 3892 S 12.4  2.0   0:06.83 proftpd  

And the throughput is around ~11Mb/s even when the card is set to 54Mb/s.
The server itself is a AMD K6-2 400MHz, so it basically can perform up to
~30Mb/s via 100Mb/s ethernet (tested). Should I go and shop a faster PC, or
is there a workaround for this CPU-consumption?

Thank you.





Here are the details of this setup:

dmesg:
driverloader: stack=8192/60/0 PREEMPT SMP
PCI: Found IRQ 10 for device 0000:00:0a.0
eth2: New link status: Disconnected (0002)
eth2: WPA, AES, TKIP, WEP128, WEP64 supported
eth2: SMC2802W 2.4GHz 54 Mbps Wireless PCI Adapter at 0000:00:0a.0 (MAC
address 00:04:E2:B5:71:56) ready
eth2: New link status: Connected (0001)

lspci -v:
0000:00:0a.0 Network controller: Intersil Corporation Intersil ISL3890
[Prism GT/Prism Duette] (rev 01)
        Subsystem: Accton Technology Corporation: Unknown device ee03
        Flags: bus master, medium devsel, latency 56, IRQ 10
        Memory at dd800000 (32-bit, non-prefetchable)
        Capabilities: [dc] Power Management version 1

lsmod:
Module                  Size  Used by
cisco_ipsec           394860  241 
driverloader          225668  0 
ip_conntrack_ftp       71028  0 
uhci_hcd               28592  0 
ehci_hcd               24548  0 
usbcore                95424  2 uhci_hcd,ehci_hcd
capability              3176  0 
commoncap               5184  1 capability

driverloader version is 1.76 and it is compiled again the 2.6.7 kernel
sources.