* Re: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
@ 2015-08-06 12:09 ` Andy Furniss
2015-08-06 14:08 ` LAMBRUSCHI Yannick (EXT)
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Andy Furniss @ 2015-08-06 12:09 UTC (permalink / raw)
To: lartc
LAMBRUSCHI Yannick (EXT) wrote:
> Hello,
>
>
> We actually have a 10Gb/s servers and 1Gb/s servers that coexist
> together (temporary migrating solution) [UDP traffic]. We would like
> to shape the traffic coming from the 10Gb/s servers in order to avoid
> big bursts that the 1G servers could not handle.
>
> It seems that "tc" cannot do the job with a tbf (or maybe we use it
> the wrong way). For instance on our 10G servers we tried the
> following:
I don't know about shaping high bandwidth.
> sudo tc qdisc add dev eth5 root tbf rate 950mbit latency 1s burst
> 50mbit peakrate 1000mbit mtu 1500
I can test this though and it's actually broken for me = no full size
traffic.
You should read man tc-tbf - the mtu setting + peakrate is an issue.
mtu on eth when playing with tc is 1514 to allow for 1500 ip level as
that's the size tc sees the packets as. Of course it may be more or less
eg. on vlan (1518) or ip level on ppp.
The mtu using your command actually prevents 1500 ip level traffic
totally (for me).
>
> Here we normally set the peakrate at 1mb (which normally can't
> generate burst > 1mb/s). Unfortunately, that does not work, in fact
> after using this tc config, we lower our main bandwidth to at max
> 2Mb/s..
>
> Our only clue for this strange behavior is that sentence in the tc
> manual:
>
> "To achieve perfection, the second bucket may contain only a single
> packet, which leads to the earlier mentioned 1mbit/s limit.
>
> This limit is caused by the fact that the kernel can only throttle
> for at minimum 1 'jiffy', which depends on HZ as 1/HZ. For perfect
> shaping, only a single packet can get sent per jiffy - for HZ\x100,
> this means 100 packets of on average 1000 bytes each, which roughly
> corresponds to 1mbit/s. "
>
> So, it's sure we can't have a peakrate > 1Mbit/s ?
>
> Maybe, there is another completely different way to achieve our goal,
> if anyone has a suggestion that would help me achieve our goal.. =)
> ?
>
> Kind regards
> N�����r��y���b�X��ǧv�^�){.n�+���j�\�{ay�\x1dʇڙ�,j\a��f���h���z�\x1e�w���\f���j:+v���w�j�m����\a����zZ+�����ݢj"��!tml>
^ permalink raw reply [flat|nested] 8+ messages in thread* RE: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
2015-08-06 12:09 ` Andy Furniss
@ 2015-08-06 14:08 ` LAMBRUSCHI Yannick (EXT)
2015-08-06 17:01 ` Andy Furniss
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: LAMBRUSCHI Yannick (EXT) @ 2015-08-06 14:08 UTC (permalink / raw)
To: lartc
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
2015-08-06 12:09 ` Andy Furniss
2015-08-06 14:08 ` LAMBRUSCHI Yannick (EXT)
@ 2015-08-06 17:01 ` Andy Furniss
2015-08-07 8:30 ` LAMBRUSCHI Yannick (EXT)
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: Andy Furniss @ 2015-08-06 17:01 UTC (permalink / raw)
To: lartc
LAMBRUSCHI Yannick (EXT) wrote:
> Hello,
>
>
> Thanks for the post. We also played with mtu 1514 (and even greater)
> but did not change anything. I really think it comes from the jiffy
> limit but can't find another way..
Strangely I have now tested with your command and mtu 1514 and I can get
gig speed OK.
I was thinking possibly you could just omit the peak rate and mtu (which
seems to be another buffer size) and see if it was OK.
I don't know why I am not limited like you but -
I am using tcp netperf.
My mobo gig nic is dumb so doesn't offload. I guess a 10 gig nic will
offload, so unless you already turned it off with ethtool it's possible
the kernel is sending huge packets to the nic.
Maybe try far bigger mtu or not bother with peakrate/mtu - FWIW setting
1000mbit peakrate is still going to be faster than a gig nic can go as
there are overheads above what tc sees.
It could be kernel settings - you mention jiffies, tbf is ancient and I
don't know whether it was ever changed, or if kernel settings can change
things.
I don't know why I am not limited like you grepping hz from my config
looks like -
ph4[1080i25]$ grep -i hz /boot/config-4.2.0-rc4-g194a336
CONFIG_HZ_PERIODIC=y
# CONFIG_NO_HZ_IDLE is not set
# CONFIG_NO_HZ_FULL is not set
# CONFIG_NO_HZ is not set
# CONFIG_HZ_100 is not set
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
CONFIG_HZ_1000=y
CONFIG_HZ\x1000
# CONFIG_MACHZ_WDT is not set
^ permalink raw reply [flat|nested] 8+ messages in thread* RE: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
` (2 preceding siblings ...)
2015-08-06 17:01 ` Andy Furniss
@ 2015-08-07 8:30 ` LAMBRUSCHI Yannick (EXT)
2015-08-07 8:44 ` Dave Taht
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: LAMBRUSCHI Yannick (EXT) @ 2015-08-07 8:30 UTC (permalink / raw)
To: lartc
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
` (3 preceding siblings ...)
2015-08-07 8:30 ` LAMBRUSCHI Yannick (EXT)
@ 2015-08-07 8:44 ` Dave Taht
2015-08-17 8:51 ` LAMBRUSCHI Yannick (EXT)
2015-09-01 15:19 ` Marco Gaiarin
6 siblings, 0 replies; 8+ messages in thread
From: Dave Taht @ 2015-08-07 8:44 UTC (permalink / raw)
To: lartc
We are certainly looking for more high-speed testers of the new "cake"
qdisc which we hope to be a successor to htb + fq_codel in many
respects. It is still out of tree but can be made to compile on most
kernels between 3.13 and 4.0. It solves the burst problem in
particular, and also runs pretty fast.
A recent preso:
http://battlemesh.org/BattleMeshV8/Agenda?action=AttachFile&do=view&target ke-battlemesh-v8.pdf
More info and where to get it:
http://www.bufferbloat.net/projects/codel/wiki/Cake
On Fri, Aug 7, 2015 at 10:30 AM, LAMBRUSCHI Yannick (EXT)
<yannick.lambruschi-ext@socgen.com> wrote:
> Hi Andy,
>
>
> I forgot to mention that but I'm not limited at all when I don't set a peakrate, it works well. But doesn't setting a peak rate means that it will allow big 10G bursts at some instant (too much for the 1G servers I think). I only get issue when I set the peak rate (which kind of linked with the jiffy if I'm not mistaken).
>
>
> Regards,
>
> Yannick
>
> -----Original Message-----
> From: Andy Furniss [mailto:adf.lists@gmail.com]
> Sent: Thursday 6 August 2015 19:01
> To: LAMBRUSCHI Yannick (EXT) ResgGtsMktMdm; lartc
> Subject: Re: Using Unix TC to shape high bandwidth traffic
>
> LAMBRUSCHI Yannick (EXT) wrote:
>> Hello,
>>
>>
>> Thanks for the post. We also played with mtu 1514 (and even greater)
>> but did not change anything. I really think it comes from the jiffy
>> limit but can't find another way..
>
> Strangely I have now tested with your command and mtu 1514 and I can get
> gig speed OK.
>
> I was thinking possibly you could just omit the peak rate and mtu (which
> seems to be another buffer size) and see if it was OK.
>
> I don't know why I am not limited like you but -
>
> I am using tcp netperf.
>
> My mobo gig nic is dumb so doesn't offload. I guess a 10 gig nic will
> offload, so unless you already turned it off with ethtool it's possible
> the kernel is sending huge packets to the nic.
>
> Maybe try far bigger mtu or not bother with peakrate/mtu - FWIW setting
> 1000mbit peakrate is still going to be faster than a gig nic can go as
> there are overheads above what tc sees.
>
> It could be kernel settings - you mention jiffies, tbf is ancient and I
> don't know whether it was ever changed, or if kernel settings can change
> things.
>
> I don't know why I am not limited like you grepping hz from my config
> looks like -
>
> ph4[1080i25]$ grep -i hz /boot/config-4.2.0-rc4-g194a336
> CONFIG_HZ_PERIODIC=y
> # CONFIG_NO_HZ_IDLE is not set
> # CONFIG_NO_HZ_FULL is not set
> # CONFIG_NO_HZ is not set
> # CONFIG_HZ_100 is not set
> # CONFIG_HZ_250 is not set
> # CONFIG_HZ_300 is not set
> CONFIG_HZ_1000=y
> CONFIG_HZ\x1000
> # CONFIG_MACHZ_WDT is not set
--
Dave Täht
worldwide bufferbloat report:
http://www.dslreports.com/speedtest/results/bufferbloat
And:
What will it take to vastly improve wifi for everyone?
https://plus.google.com/u/0/explore/makewififast
--
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the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 8+ messages in thread* RE: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
` (4 preceding siblings ...)
2015-08-07 8:44 ` Dave Taht
@ 2015-08-17 8:51 ` LAMBRUSCHI Yannick (EXT)
2015-09-01 15:19 ` Marco Gaiarin
6 siblings, 0 replies; 8+ messages in thread
From: LAMBRUSCHI Yannick (EXT) @ 2015-08-17 8:51 UTC (permalink / raw)
To: lartc
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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: Using Unix TC to shape high bandwidth traffic
2015-08-03 13:38 Using Unix TC to shape high bandwidth traffic LAMBRUSCHI Yannick (EXT)
` (5 preceding siblings ...)
2015-08-17 8:51 ` LAMBRUSCHI Yannick (EXT)
@ 2015-09-01 15:19 ` Marco Gaiarin
6 siblings, 0 replies; 8+ messages in thread
From: Marco Gaiarin @ 2015-09-01 15:19 UTC (permalink / raw)
To: lartc
Mandi! Dave Taht
In chel di` si favelave...
> More info and where to get it:
> http://www.bufferbloat.net/projects/codel/wiki/Cake
Someone have just recompiled kernel modules and iproute utility for
debian AS debian packages?
Thanks.
--
dott. Marco Gaiarin GNUPG Key ID: 240A3D66
Associazione ``La Nostra Famiglia'' http://www.sv.lnf.it/
Polo FVG - Via della Bontà, 7 - 33078 - San Vito al Tagliamento (PN)
marco.gaiarin(at)lanostrafamiglia.it t +39-0434-842711 f +39-0434-842797
Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
http://www.lanostrafamiglia.it/25/index.php/component/k2/item/123
(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)
^ permalink raw reply [flat|nested] 8+ messages in thread