Hi Sergei

Thanks for your replying!

On 05/16/2014 02:20 AM, Sergei Shtylyov wrote:

Hello.

On 05/15/2014 10:28 AM, カオ　ミン　ヒェップ wrote:

quoted

I am Hiep from JINZAI SOLUTION (a Japanese Company).
Now, I am testing a upstream-v3.15-rc2 on Lager for Renesas RSO.
I found a problem about Ethernet Driver so I would like to report to 
you.
The problem is losing data when sending data by UDP:

quoted

     - From Lager board to PC:
     BANDWIDTH from 10M to 70M are good,  but they suddenly down 51.2
Mbits/sec at 80M
     and 57.8 Mbits/sec at 90 M and 64.2 Mbits/sec at 100M.

   Do you mean 'iperf' tests here?

Yes, I used 'iperf' tool to test here.
And the results of test these test-cases on upstream-v3.15-rc5 as show 
below:
79.9 Mbits/sec at 80M, 81.5 Mbits/sec at 90 M and 75.1 Mbits/sec at 100M.

quoted

     - From PC to Lager board:
    Some time when the message of "sh-eth r8a7790-ether eth0: Receive 
FIFO
Overflow" occurs,
    some of datagrams will be lost as the logs show below:
     「$ iperf -c 172.16.1.36 -u -b 90M
     .....
     [  3] Server Report:
     [  3]  0.0-10.0 sec   108 MBytes  90.4 Mbits/sec   0.000 ms 
36/76923
(0.047%)
     .....
     # iperf -s -u
     [ ID] Interval       Transfer     Bandwidth        Jitter 
Lost/Total
Datagrams
     sh-eth r8a7790-ether eth0: Receive FIFO Overflow
     [  3]  0.0-10.0 sec   108 MBytes  90.4 Mbits/sec   0.001 ms 
36/76923
(0.047%)

quoted

Please review it when you have time.

   Please try this patch:

http://marc.info/?l=linux-netdev&m=139602519809181

I have tested this patch on v3.15.0-rc5-00077-g14186fe, and results are 
the message of
"sh-eth r8a7790-ether eth0: Receive FIFO Overflow" has disappeared and 
sending datagrams is good.
(Bandwidth 10M to 100M: Test with 5/5 times by script and by hand are good)

Bests Regards.
Hiep.