netdev - Re: [BUG] ixgbe: something wrong with queue selection ?

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Date:	Tue, 17 Apr 2012 02:16:27 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>
Cc:	Greg Rose <gregory.v.rose@...el.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [BUG] ixgbe: something wrong with queue selection ?

On Tue, 2012-04-17 at 11:06 +0200, Eric Dumazet wrote:
> Hi guys
> 
> I have bad feelings with ixgbe and its multiqueue selection.
> 
> On a quad core machine (Q6600), I get lots of reorderings on a single
> TCP stream.
> 
> 
> Apparently packets happily spread on all available queues, instead of a
> single one.
> 
> This defeats GRO at receiver and TCP performance is really bad.
> 
> # ethtool -S eth5|egrep "x_queue_[0123]_packets" ; taskset 1 netperf -H
> 192.168.99.1 ; ethtool -S eth5|egrep "x_queue_[0123]_packets"
>      tx_queue_0_packets: 24
>      tx_queue_1_packets: 26
>      tx_queue_2_packets: 32
>      tx_queue_3_packets: 16
>      rx_queue_0_packets: 11
>      rx_queue_1_packets: 47
>      rx_queue_2_packets: 27
>      rx_queue_3_packets: 22
> MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.99.1 (192.168.99.1) port 0 AF_INET
> Recv   Send    Send                          
> Socket Socket  Message  Elapsed              
> Size   Size    Size     Time     Throughput  
> bytes  bytes   bytes    secs.    10^6bits/sec  
> 
>  87380  16384  16384    10.00    3866.43   
>      tx_queue_0_packets: 1653201
>      tx_queue_1_packets: 608000
>      tx_queue_2_packets: 541382
>      tx_queue_3_packets: 536543
>      rx_queue_0_packets: 434703
>      rx_queue_1_packets: 137444
>      rx_queue_2_packets: 131023
>      rx_queue_3_packets: 128407
> 
> # ip ro get 192.168.99.1
> 192.168.99.1 dev eth5  src 192.168.99.2 
>     cache  ipid 0x438b rtt 4ms rttvar 4ms cwnd 57 reordering 127
> 
> # lspci -v -s 02:00.0
> 02:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit
> SFI/SFP+ Network Connection (rev 01)
> 	Subsystem: Intel Corporation Ethernet Server Adapter X520-2
> 	Flags: bus master, fast devsel, latency 0, IRQ 16
> 	Memory at f1100000 (64-bit, prefetchable) [size=512K]
> 	I/O ports at b000 [size=32]
> 	Memory at f1200000 (64-bit, prefetchable) [size=16K]
> 	Capabilities: [40] Power Management version 3
> 	Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
> 	Capabilities: [70] MSI-X: Enable+ Count=64 Masked-
> 	Capabilities: [a0] Express Endpoint, MSI 00
> 	Capabilities: [100] Advanced Error Reporting
> 	Capabilities: [140] Device Serial Number 00-1b-21-ff-ff-4a-fe-54
> 	Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
> 	Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
> 	Kernel driver in use: ixgbe
> 	Kernel modules: ixgbe
> 
> 

Adding Don Skidmore and Alex Duyck...

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