netdev - Re: [PATCH 0/3] [RFC] Implement multiqueue (RX & TX) virtio-net

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Date:	Mon, 28 Feb 2011 09:35:15 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Krishna Kumar <krkumar2@...ibm.com>
Cc:	rusty@...tcorp.com.au, davem@...emloft.net, eric.dumazet@...il.com,
	arnd@...db.de, netdev@...r.kernel.org, horms@...ge.net.au,
	avi@...hat.com, anthony@...emonkey.ws, kvm@...r.kernel.org
Subject: Re: [PATCH 0/3] [RFC] Implement multiqueue (RX & TX) virtio-net

On Mon, Feb 28, 2011 at 12:04:27PM +0530, Krishna Kumar wrote:
> This patch series is a continuation of an earlier one that
> implemented guest MQ TX functionality.  This new patchset
> implements both RX and TX MQ.  Qemu changes are not being
> included at this time solely to aid in easier review.
> Compatibility testing with old/new combinations of qemu/guest
> and vhost was done without any issues.
> 
> Some early TCP/UDP test results are at the bottom of this
> post, I plan to submit more test results in the coming days.
> 
> Please review and provide feedback on what can improve.
> 
> Thanks!
> 
> Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>


To help testing, could you post the qemu changes separately please?

> ---
> 
> 
> Test configuration:
>           Host:  8 Intel Xeon, 8 GB memory
>           Guest: 4 cpus, 2 GB memory
> 
> Each test case runs for 60 secs, results below are average over
> two runs.  Bandwidth numbers are in gbps.  I have used default
> netperf, and no testing/system tuning other than taskset each
> vhost to 0xf (cpus 0-3).  Comparison is testing original kernel
> vs new kernel with #txqs=8 ("#" refers to number of netperf
> sessions).
> 
> _______________________________________________________________________
>                 TCP: Guest -> Local Host (TCP_STREAM)
> #    BW1    BW2 (%)         SD1    SD2 (%)       RSD1    RSD2 (%)
> _______________________________________________________________________
> 1    7190   7170 (-.2)      0      0 (0)          3       4 (33.3)
> 2    8774   11235 (28.0)    3      3 (0)          16      14 (-12.5)
> 4    9753   15195 (55.7)    17     21 (23.5)      65      59 (-9.2)
> 8    10224  18265 (78.6)    71     115 (61.9)     251     240 (-4.3)
> 16   10749  18123 (68.6)    277    456 (64.6)     985     925 (-6.0)
> 32   11133  17351 (55.8)    1132   1947 (71.9)    3935    3831 (-2.6)
> 64   11223  17115 (52.4)    4682   7836 (67.3)    15949   15373 (-3.6)
> 128  11269  16986 (50.7)    19783  31505 (59.2)   66799   61759 (-7.5)
> _______________________________________________________________________
> Summary:      BW: 37.6      SD: 61.2      RSD: -6.5
> 
> 
> _______________________________________________________________________
>                  TCP: Local Host -> Guest (TCP_MAERTS)
> #    BW1    BW2 (%)        SD1    SD2 (%)        RSD1    RSD2 (%)
> _______________________________________________________________________
> 1    11490  10870 (-5.3)   0      0 (0)          2       2 (0)
> 2    10612  10554 (-.5)    2      3 (50.0)       12      12 (0)
> 4    10047  14320 (42.5)   13     16 (23.0)      53      53 (0)
> 8    9273   15182 (63.7)   56     84 (50.0)      228     233 (2.1)
> 16   9291   15853 (70.6)   235    390 (65.9)     934     965 (3.3)
> 32   9382   15741 (67.7)   969    1823 (88.1)    3868    4037 (4.3)
> 64   9270   14585 (57.3)   3966   8836 (122.7)   15415   17818 (15.5)
> 128  8997   14678 (63.1)   17024  36649 (115.2)  64933   72677 (11.9)
> _______________________________________________________________________
> SUM:      BW: 24.8      SD: 114.6      RSD: 12.1
> 
> ______________________________________________________
>             UDP: Local Host -> Guest (UDP_STREAM)
> #      BW1      BW2 (%)        SD1    SD2 (%)
> ______________________________________________________
> 1      17236    16585 (-3.7)    1      1 (0)
> 2      16795    22693 (35.1)    5      6 (20.0)
> 4      13390    21502 (60.5)    37     36 (-2.7)
> 8      13261    24361 (83.7)    163    175 (7.3)
> 16     12772    23796 (86.3)    692    826 (19.3)
> 32     12832    23880 (86.0)    2812   2871 (2.0)
> 64     12779    24293 (90.1)    11299  11237 (-.5)
> 128    13006    24857 (91.1)    44778  43884 (-1.9)
> ______________________________________________________
> Summary:      BW: 37.1      SD: -1.2
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