Subject: Re: RFT: virtio_net: limit xmit polling

From: Tom Lendacky <[email-masked]>
Date: Tue, 28 Jun 2011 11:08:07 -0500

On Sunday, June 19, 2011 05:27:00 AM Michael S. Tsirkin wrote:
> OK, different people seem to test different trees.  In the hope to get
> everyone on the same page, I created several variants of this patch so
> they can be compared. Whoever's interested, please check out the
> following, and tell me how these compare:
> 
> kernel:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
> 
> virtio-net-limit-xmit-polling/base - this is net-next baseline to test
> against virtio-net-limit-xmit-polling/v0 - fixes checks on out of capacity
> virtio-net-limit-xmit-polling/v1 - previous revision of the patch
> 		this does xmit,free,xmit,2*free,free
> virtio-net-limit-xmit-polling/v2 - new revision of the patch
> 		this does free,xmit,2*free,free
> 

Here's a summary of the results.  I've also attached an ODS format spreadsheet
(30 KB in size) that might be easier to analyze and also has some pinned VM
results data.  I broke the tests down into a local guest-to-guest scenario
and a remote host-to-guest scenario.

Within the local guest-to-guest scenario I ran:
  - TCP_RR tests using two different messsage sizes and four different
    instance counts among 1 pair of VMs and 2 pairs of VMs.
  - TCP_STREAM tests using four different message sizes and two different
    instance counts among 1 pair of VMs and 2 pairs of VMs.

Within the remote host-to-guest scenario I ran:
  - TCP_RR tests using two different messsage sizes and four different
    instance counts to 1 VM and 4 VMs.
  - TCP_STREAM and TCP_MAERTS tests using four different message sizes and
    two different instance counts to 1 VM and 4 VMs.
over a 10GbE link.

*** Local Guest-to-Guest ***

Here's the local guest-to-guest summary for 1 VM pair doing TCP_RR with
256/256 request/response message size in transactions per second:

Instances	Base		V0		V1		V2
1		 8,151.56	 8,460.72	 8,439.16	 9,990.37
25		48,761.74	51,032.62	51,103.25	49,533.52
50		55,687.38	55,974.18	56,854.10	54,888.65
100		58,255.06	58,255.86	60,380.90	59,308.36

Here's the local guest-to-guest summary for 2 VM pairs doing TCP_RR with
256/256 request/response message size in transactions per second:

Instances	Base		V0		V1		V2
1		18,758.48	19,112.50	18,597.07	19,252.04
25		80,500.50	78,801.78	80,590.68	78,782.07
50		80,594.20	77,985.44	80,431.72	77,246.90
100		82,023.23	81,325.96	81,303.32	81,727.54

Here's the local guest-to-guest summary for 1 VM pair doing TCP_STREAM with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		   961.78	 1,115.92	   794.02	   740.37
4		 2,498.33	 2,541.82	 2,441.60	 2,308.26

1K:					
1		 3,476.61	 3,522.02	 2,170.86	 1,395.57
4		 6,344.30	 7,056.57	 7,275.16	 7,174.09

4K:					
1		 9,213.57	10,647.44	 9,883.42	 9,007.29
4		11,070.66	11,300.37	11,001.02	12,103.72

16K:
1		12,065.94	 9,437.78	11,710.60	 6,989.93
4		12,755.28	13,050.78	12,518.06	13,227.33

Here's the local guest-to-guest summary for 2 VM pairs doing TCP_STREAM with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		 2,434.98	 2,403.23	 2,308.69	 2,261.35
4		 5,973.82	 5,729.48	 5,956.76	 5,831.86

1K:
1		 5,305.99	 5,148.72	 4,960.67	 5,067.76
4		10,628.38	10,649.49	10,098.90	10,380.09

4K:
1		11,577.03	10,710.33	11,700.53	10,304.09
4		14,580.66	14,881.38	14,551.17	15,053.02

16K:
1		16,801.46	16,072.50	15,773.78	15,835.66
4		17,194.00	17,294.02	17,319.78	17,121.09

*** Remote Host-to-Guest ***

Here's the remote host-to-guest summary for 1 VM doing TCP_RR with
256/256 request/response message size in transactions per second:

Instances	Base		V0		V1		V2
1		 9,732.99	10,307.98	10,529.82	 8,889.28
25		43,976.18	49,480.50	46,536.66	45,682.38
50		63,031.33	67,127.15	60,073.34	65,748.62
100		64,778.43	65,338.07	66,774.12	69,391.22

Here's the remote host-to-guest summary for 4 VMs doing TCP_RR with
256/256 request/response message size in transactions per second:

Instances	Base		V0		V1		V2
1		 39,270.42	 38,253.60	 39,353.10	 39,566.33
25		207,120.91	207,964.50	211,539.70	213,882.21
50		218,801.54	221,490.56	220,529.48	223,594.25
100		218,432.62	215,061.44	222,011.61	223,480.47

Here's the remote host-to-guest summary for 1 VM doing TCP_STREAM with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		2,274.74	2,220.38	2,245.26	2,212.30
4		5,689.66	5,953.86	5,984.80	5,827.94

1K:
1		7,804.38	7,236.29	6,716.58	7,485.09
4		7,722.42	8,070.38	7,700.45	7,856.76

4K:
1		8,976.14	9,026.77	9,147.32	9,095.58
4		7,532.25	7,410.80	7,683.81	7,524.94

16K:
1		8,991.61	9,045.10	9,124.58	9,238.34
4		7,406.10	7,626.81	7,711.62	7,345.37

Here's the remote host-to-guest summary for 1 VM doing TCP_MAERTS with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		1,165.69	1,181.92	1,152.20	1,104.68
4		2,580.46	2,545.22	2,436.30	2,601.74

1K:
1		2,393.34	2,457.22	2,128.86	2,258.92
4		7,152.57	7,606.60	8,004.64	7,576.85

4K:
1		9,258.93	8,505.06	9,309.78	9,215.05
4		9,374.20	9,363.48	9,372.53	9,352.00

16K:
1		9,244.70	9,287.72	9,298.60	9,322.28
4		9,380.02	9,347.50	9,377.46	9,372.98

Here's the remote host-to-guest summary for 4 VMs doing TCP_STREAM with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		9,392.37	9,390.74	9,395.58	9,392.46
4		9,394.24	9,394.46	9,395.42	9,394.05

1K:
1		9,396.34	9,397.46	9,396.64	9,443.26
4		9,397.14	9,402.25	9,398.67	9,391.09

4K:
1		9,397.16	9,398.07	9,397.30	9,396.33
4		9,395.64	9,400.25	9,397.54	9,397.75

16K:
1		9,396.58	9,397.01	9,397.58	9,397.70
4		9,399.15	9,400.02	9,399.66	9,400.16

Here's the remote host-to-guest summary for 4 VMs doing TCP_MAERTS with
256, 1K, 4K and 16K message size in Mbps:

256:
Instances	Base		V0		V1		V2
1		5,048.66	5,007.26	5,074.98	4,974.86
4		9,217.23	9,245.14	9,263.97	9,294.23

1K:
1		9,378.32	9,387.12	9,386.21	9,361.55
4		9,384.42	9,384.02	9,385.50	9,385.55

4K:
1		9,391.10	9,390.28	9,389.70	9,391.02
4		9,384.38	9,383.39	9,384.74	9,384.19

16K:
1		9,390.77	9,389.62	9,388.07	9,388.19
4		9,381.86	9,382.37	9,385.54	9,383.88

Tom

> There's also this on top:
> virtio-net-limit-xmit-polling/v3 -> don't delay avail index update
> I don't think it's important to test this one, yet
> 
> Userspace to use: event index work is not yet merged upstream
> so the revision to use is still this:
> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git
> virtio-net-event-idx-v3
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