(Top-posting)
I sent you a tar ball of a patched 1.9.5 e1000e that should resolve both of the
issues you're seeing. Please let me know if you have any problems with it.
Cheers,
Matthew
From: Nishit Shah [mailto:[email protected]]
Sent: Tuesday, June 19, 2012 10:33 PM
To: Vick, Matthew
Cc: [email protected]
Subject: Re: [E1000-devel] problem with simplified balancing on 82574 chips
Thanks Mathew,
It really helps a lot in understanding the workings.
Rgds,
Nishit Shah.
On 6/20/2012 6:27 AM, Vick, Matthew wrote:
(Top-posting)
Thanks for the additional data. 82574, being a newer part, has a more efficient
interrupt mechanism for the driver to use than previous parts. The restriction
on interrupts with InterruptThrottleRate obviously helps CPU utilization, but
it isn't going to be as dramatic of a change when compared to other parts the
interrupts are already more efficient.
I'm still working to create a finalized patch that resolves both issues you've
raised.
Cheers,
Matthew
From: Nishit Shah [mailto:[email protected]]
Sent: Tuesday, June 19, 2012 5:47 AM
To: Vick, Matthew
Cc: [email protected]<mailto:[email protected]>
Subject: Re: [E1000-devel] problem with simplified balancing on 82574 chips
Hi Matthew,
1.) vmstat and top output with ethtool -C <nic> rx-usecs 0 as well as
ethtool -C <nic> rx-usecs 3. (In my case both are giving me the same results)
# vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in
cs us sy id wa st
0 0 0 2013040 11748 5736 0 0 0 0 40644 18 0 23
77 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40736 28 0 23
77 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40730 10 0 24
76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40731 14 0 24
76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40735 24 0 24
76 0 0
0 0 0 2013040 11748 5736 0 0 0 0 40732 12 0 24
76 0 0
# top output
Tasks: 41 total, 1 running, 40 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, 52.8%id, 0.0%wa, 1.3%hi, 45.8%si, 0.0%st
2.) vmstat and top output with ethtool -C <nic> rx-usecs 4
# vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs
us sy id wa st
0 0 0 2012916 11804 5740 0 0 0 0 18599 20 0 23
77 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18588 14 0 22
78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18592 12 0 22
78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18591 12 0 22
78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18593 11 0 22
78 0 0
0 0 0 2012916 11804 5740 0 0 0 0 18594 12 0 23
77 0 0
# top output
Tasks: 41 total, 1 running, 40 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni, 53.3%id, 0.0%wa, 0.3%hi, 46.3%si, 0.0%st
I can see a good amount of drop in interrupts in vmstat. i.e. 40600 to 18600
but I don't see much improvement in top output in terms of CPU utilization.
Rgds,
Nishit Shah.
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