Date: Fri, 22 Jul 2011 15:46:06 -0400 From: Mike Tancsa <mike@sentex.net> To: "Michael W. Lucas" <mwlucas@blackhelicopters.org> Cc: questions@freebsd.org Subject: Re: em0 NIC slow on 8.2-p1 amd64? Message-ID: <4E29D37E.8070908@sentex.net> In-Reply-To: <20110722190821.GA55040@bewilderbeast.blackhelicopters.org> References: <20110720160432.GA41775@bewilderbeast.blackhelicopters.org> <4D6348DC01B1E406@> <20110720191640.GA42821@bewilderbeast.blackhelicopters.org> <4D301C9702145855@> <20110721141011.GB47190@bewilderbeast.blackhelicopters.org> <4D7F86D5017EB3D8@> <20110721151210.GA47663@bewilderbeast.blackhelicopters.org> <4D301C9702253683@> <4E29BC1F.6060103@sentex.net> <20110722190821.GA55040@bewilderbeast.blackhelicopters.org>
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On 7/22/2011 3:08 PM, Michael W. Lucas wrote:
>
> Basically the same. I don't think it's disk.
Are you able to saturate the ethernet ? Try something like
/usr/src/tools/tools/netrate/netblast/netblast
on the local ethernet and see if you can generate and receive a full
gigabit on the wire
# ./netblast 10.11.11.243 500 250 10
start: 1311363559.619619931
finish: 1311363569.619418229
send calls: 5210086
send errors: 1249890
approx send rate: 396019
approx error rate: 0
./netblast 10.11.11.241 500 300 10
start: 1311346264.584043978
finish: 1311346274.583848423
send calls: 7417664
send errors: 4214676
approx send rate: 320298
approx error rate: 0
When the sender if an igb nic, I am able to push out 955Mb to the em0
nic acting as a sink. The other way around, 855Mb
The em nic is
em1@pci0:5:0:0: class=0x020000 card=0x34ec8086 chip=0x10d38086 rev=0x00
hdr=0x00
vendor = 'Intel Corporation'
device = 'Intel 82574L Gigabit Ethernet Controller (82574L)'
class = network
subclass = ethernet
bar [10] = type Memory, range 32, base 0xb2500000, size 131072,
enabled
bar [18] = type I/O Port, range 32, base 0x1000, size 32, enabled
bar [1c] = type Memory, range 32, base 0xb2520000, size 16384, enabled
cap 01[c8] = powerspec 2 supports D0 D3 current D0
cap 05[d0] = MSI supports 1 message, 64 bit
cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)
cap 11[a0] = MSI-X supports 5 messages in map 0x1c enabled
ecap 0001[100] = AER 1 0 fatal 0 non-fatal 1 corrected
ecap 0003[140] = Serial 1 001517ffffed36e4
em1: <Intel(R) PRO/1000 Network Connection 7.2.3> port 0x1000-0x101f mem
0xb2500000-0xb251ffff,0xb2520000-0xb2523fff irq 16 at device 0.0 on pci5
em1: Using MSIX interrupts with 3 vectors
em1: [ITHREAD]
em1: [ITHREAD]
em1: [ITHREAD]
em1: Ethernet address: 00:15:17:ed:36:e4
ifstat -b shows
# ifstat -b -i igb0
igb0
Kbps in Kbps out
0.00 0.00
0.00 0.00
578794.0 0.00
855298.0 0.00
855365.9 0.00
855316.6 0.00
855335.2 0.00
855346.5 0.00
855358.6 0.00
855368.7 0.00
855356.6 0.00
727163.6 0.00
0.00 0.00
thats the em equipped machine generating the traffic
---Mike
>
> There's kern/152828 claiming a performance regression with em under
> 8.2, but I'm not sure if that is applicable to my system. I'd upgrade
> the kernel to test, but I'm not brave enough to downgrade the kernel
> to 8.0 for comparison. (I've never had good luck running an old kernel
> on a new userland.)
>
> ==ml
>
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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