Re: [E1000-devel] DCA seems not work properly.

Thu, 16 Jul 2009 00:53:03 -0700 

Thank you for your reply.

First, please forgive my poor understanding and poor English.
According to device driver source code, DCA seems a component of I/OAT QuickData Technology. 
and It seems work on DCA. so, DCA should be enabled. Is it right?
I'm not sure about relationship between DCA and the QuickData Technology.
from the document named "Intel QuickData technology software guide for Linux", 
there are number of APIs for QuickData technology.
I think it means if I want more efficient data movement then I must use those APIs. Is it right? 
then..
is it means that just by means of DCA enabling, there're maybe no CPU utilization improvement? 
FYI, I'm focusing all the packet receiving performance.
If you can, please let me know the best way how do I know the DCA is working. 

Thank you for your concern.

Best Regards.

Sosnowski, Maciej 쓴 글:

There should be DCA available to enable in BIOS.
If there is none and despite enabling I/OAT you still see "DCA is not enabled in 
BIOS" message, this means there is a BIOS issue. You should contact the BIOS vendor.
The system DCA configuration you show below looks fine.
With DCA enabled there should be CPU utilization improvement observed.

Regards,
Maciej

-----Original Message-----
From: ??? [mailto:[email protected]] Sent: Wednesday, July 15, 2009 10:04 AM 
To: [email protected]
Subject: Re: [E1000-devel] DCA seems not work properly.

I've also disabled two of BIOS option.
that are adjacent cache line prefetcher and hardware prefetch queue.
What's wrong with me?
and I'd like to know what is the best way to know that feature is working properly. 

thanks a lot.

Best Regards.

Rich wrote:

Hi there.

I'm evaluating DCA feature of 82598EB 10G NIC.
But It seems not work properly, I think.
Please, help me out.

FYI, My configuration work flows are like below.

1. First, my evaluation system consist of
  Intel S5000PSL STAT mainboard
  Intel Quad-Core Xeon processor * 2
  Intel 10G XF SR(EXPX9501AFXSR) -> 82598EB NIC
and OS is Ubuntu 9.04 server (kernel version 2.6.28-13-server) and I've used driver ioatdma-3.61, ixgbe-2.0.34.3 from sourceforge e1000 forum. 

2. I configured Intel I/OAT enable in BIOS
Even though I enabled Intel I/OAT in BIOS, Kernel said that DCA is not enabled in BIOS. 
  I don't know why kernel said like that.
3. Because of kernel's complaining, I've patched http://patchwork.kernel.org/patch/15273 
  As you maybe know, It make DCA enable forcefully.
  After that, ixgbe driver recognized as DCA can be enabled.
4. And the last, Whole of configuration results are like below. Please check them out. 

r...@intel-server:~$ insmod /usr/src/ioatdma-3.61/dca/dca.ko
r...@intel-server:~$ insmod /usr/src/ioatdma-3.61/ioatdma/ioatdma.ko
r...@intel-server:~$ insmod /usr/src/ixgbe-2.0.34.3/src/ixgbe.ko

r...@intel-server:~$ lsmod
Module                  Size  Used by
ioatdma                35592  0
ixgbe                 178120  0
dca                    16612  2 ioatdma,ixgbe

r...@intel-server:/sys/class/dca$ ls -l
lrwxrwxrwx 1 root root 0 2009-07-14 18:15 dca0 -> ../../devices/pci0000:00/0000:00:08.0/dca/dca0 lrwxrwxrwx 1 root root 0 2009-07-14 18:15 requester0 -> ../../devices/pci0000:00/0000:00:08.0/dca/dca0/requester0 

r...@intel-server:/sys/class/dma$ ls -l
lrwxrwxrwx 1 root root 0 2009-07-14 18:15 dma0chan0 -> ../../devices/pci0000:00/0000:00:08.0/dma/dma0chan0 lrwxrwxrwx 1 root root 0 2009-07-14 18:15 dma0chan1 -> ../../devices/pci0000:00/0000:00:08.0/dma/dma0chan1 lrwxrwxrwx 1 root root 0 2009-07-14 18:15 dma0chan2 -> ../../devices/pci0000:00/0000:00:08.0/dma/dma0chan2 lrwxrwxrwx 1 root root 0 2009-07-14 18:15 dma0chan3 -> ../../devices/pci0000:00/0000:00:08.0/dma/dma0chan3 

r...@intel-server:/sys/class/net/eth10# ls -l
-r--r--r-- 1 root root 4096 2009-07-14 18:16 addr_len
-r--r--r-- 1 root root 4096 2009-07-14 18:14 address
-r--r--r-- 1 root root 4096 2009-07-14 18:16 broadcast
-r--r--r-- 1 root root 4096 2009-07-14 18:16 carrier
-r--r--r-- 1 root root 4096 2009-07-14 18:16 dev_id
lrwxrwxrwx 1 root root    0 2009-07-14 18:16 device -> ../../../0000:0c:00.0
-r--r--r-- 1 root root 4096 2009-07-14 18:16 dormant
-r--r--r-- 1 root root 4096 2009-07-14 18:16 features
-rw-r--r-- 1 root root 4096 2009-07-14 18:16 flags
-rw-r--r-- 1 root root 4096 2009-07-14 18:16 ifalias
-r--r--r-- 1 root root 4096 2009-07-14 18:16 ifindex
-r--r--r-- 1 root root 4096 2009-07-14 18:16 iflink
-r--r--r-- 1 root root 4096 2009-07-14 18:16 link_mode
-rw-r--r-- 1 root root 4096 2009-07-14 18:16 mtu
-r--r--r-- 1 root root 4096 2009-07-14 18:16 operstate
drwxr-xr-x 2 root root    0 2009-07-14 18:16 power
drwxr-xr-x 2 root root    0 2009-07-14 18:16 statistics
lrwxrwxrwx 1 root root 0 2009-07-14 18:16 subsystem -> ../../../../../../class/net 
-rw-r--r-- 1 root root 4096 2009-07-14 18:16 tx_queue_len
-r--r--r-- 1 root root 4096 2009-07-14 18:14 type
-rw-r--r-- 1 root root 4096 2009-07-14 18:16 uevent

r...@intel-server:/usr/src/ethregs-1.7.1# ./ethregs -c | grep DCA
    DCA_RXCTRL[0]  000010e1
    DCA_RXCTRL[1]  000010e3
    DCA_RXCTRL[2]  000010ed
    DCA_RXCTRL[3]  000010ef
    DCA_RXCTRL[4]  000010ed
    DCA_RXCTRL[5]  000010ef
    DCA_RXCTRL[6]  000010e1
    DCA_RXCTRL[7]  000010e3
    DCA_RXCTRL[8]  0000b200
    DCA_RXCTRL[9]  0000b200
    DCA_RXCTRL[10] 0000b200
    DCA_RXCTRL[11] 0000b200
    DCA_RXCTRL[12] 0000b200
    DCA_RXCTRL[13] 0000b200
    DCA_RXCTRL[14] 0000b200
    DCA_RXCTRL[15] 0000b200
    DCA_TXCTRL[0]  00002221
    DCA_TXCTRL[1]  00002223
    DCA_TXCTRL[2]  0000222d
    DCA_TXCTRL[3]  0000222f
    DCA_TXCTRL[4]  0000222d
    DCA_TXCTRL[5]  0000222f
    DCA_TXCTRL[6]  00002221
    DCA_TXCTRL[7]  00002223
    DCA_TXCTRL[8]  00002a00
    DCA_TXCTRL[9]  00002a00
    DCA_TXCTRL[10] 00002a00
    DCA_TXCTRL[11] 00002a00
    DCA_TXCTRL[12] 00002a00
    DCA_TXCTRL[13] 00002a00
    DCA_TXCTRL[14] 00002a00
    DCA_TXCTRL[15] 00002a00
    DCA_ID         00000c01
    DCA_CTRL       00000002

If you need more information, please let me know.
Thank you in advance.

Best regards.

P.S. Whenever I post a question, I'm afraid of my poor English.

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