On 24.05.2013 16:46, Axel Fischer wrote:
Hi Igor,
my name is Axel Fischer. working at Marvell SC.
Hi Axel,
In addition to your reply to my colleague Lino
Sanfilippo I did some performance measurements
on FreeBSD 9 with a commercial 10 GBit network
card.
Which driver?
Unlike on other OS the FreeBSD performance
for duplex rx/tx operation never exceeded the
limit about 9.5 GBit/s. Normally a performance
of at least 16 GBit (up to line speed 20 GBit
in duplex mode) is expected.
As Lino already mentioned the CPU/bus system
(in general the HW) does not set a limit.
Furthermore I noticed that the CPU(s) load
is not very high, about 30 %.
Your RX/TX is probably serialized in the driver and you can only
make use of one core.
Here is an overview of the measurements:
netperf rx-tx 4 streams / 60s
1768.16 Mb/s Port=2001 RX
999.33 Mb/s Port=2002 RX
72.16 Mb/s Port=1001 TX
61.49 Mb/s Port=1002 TX
2302.76 Mb/s Port=2003 RX
73.48 Mb/s Port=1003 TX
2416.23 Mb/s Port=2004 RX
76.02 Mb/s Port=1004 TX
==== > RX+TX Total Result: Mb/s 7769.63
CPU load:
last pid: 1739; load averages: 0.97, 0.49, 0.21 up 0+00:02:26
11:02:52
46 processes: 2 running, 44 sleeping
CPU 0: 2.0% user, 0.0% nice, 23.2% system, 0.4% interrupt, 74.4% idle
CPU 1: 1.2% user, 0.0% nice, 19.7% system, 0.4% interrupt, 78.7% idle
CPU 2: 0.0% user, 0.0% nice, 0.0% system, 80.7% interrupt, 19.3% idle
CPU 3: 0.0% user, 0.0% nice, 0.8% system, 1.6% interrupt, 97.6% idle
CPU 4: 2.4% user, 0.0% nice, 25.6% system, 0.0% interrupt, 72.0% idle
CPU 5: 3.1% user, 0.0% nice, 25.6% system, 0.0% interrupt, 71.3% idle
CPU 6: 0.0% user, 0.0% nice, 0.4% system, 32.7% interrupt, 66.9% idle
CPU 7: 0.4% user, 0.0% nice, 1.6% system, 0.0% interrupt, 98.0% idle
Mem: 14M Active, 7548K Inact, 66M Wired, 24K Cache, 16M Buf, 3326M Free
Swap: 4096M Total, 4096M Free
Additionally I noticed the following TCP errors
with netstat -s ...:
1186 data packets (1717328 bytes) retransmitted
This may happen and is typically not cause for concern on
a loaded system.
6847875 window update packets
Normal.
2319 duplicate acks
Related to the retransmits.
25831 out-of-order packets (37403288 bytes)
This is unusual. What kind of test setup do you have,
back-to-back cards or a switch in between? Out of order
normally shouldn't happen unless over the internet.
3733 discarded due to memory problems (drops)
1186 segment rexmits in SACK recovery episodes
1717328 byte rexmits in SACK recovery episodes
Again related to retransmits.
My questions:
- What is the max. performance (duplex) on
FreeBSD 9 that you have measured with a 10 GBit
NIC ?
(Expected > 16 GBit/s on appropriate HW)
Certain large CDN are known to push more than 20Gbit/s production
traffic per machine.
Please also my other message from today to hackers@ "Re: preemptive
kernel" with Message-ID: <[email protected]>.
--
Andre
Thank you in advance,
Axel
-------- Weitergeleitete Nachricht --------
Von: Igor Mozolevsky <[email protected]>
An: Lino Sanfilippo <[email protected]>
Kopie: Hackers freeBSD <[email protected]>, Axel Fischer
<[email protected]>, Ralf Assmann <[email protected]>, Markus
Althoff <[email protected]>
Betreff: Re: Low Tx-Rx performance with 10Gb NICs
Datum: Thu, 23 May 2013 11:21:08 -0700
On 23 May 2013 19:00, Lino Sanfilippo <[email protected]> wrote:
Is there a known issue concerning high traffic on Tx and Rx paths? Are there
any system
settings I could adjust to get the expected performance? Any hints are very
appreciated.
check your ierrs and oerrs: netstat -s 1, I've noticed I'm getting
ierrs on em chips, but none on fxp chips (connected to the same
wire/switch); might be unrelated to yours, but worth a check...
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