[libvirt] [PATCH v2 1/8] bandwidth: Attach sfq to leaf node
Michal Privoznik
mprivozn at redhat.com
Tue Dec 11 10:42:46 UTC 2012
On 11.12.2012 02:01, Laine Stump wrote:
> On 12/04/2012 02:18 PM, Michal Privoznik wrote:
>> SFQ is qdisc which doesn't really shape any traffic but
>> 'just' re-arrange packets in sending buffer so no stream
>> starve. The goal is to ensure fairness. There is basically
>> only one configuration parameter (perturb) which is set to
>> advised value of 10.
>
> What does sfq stand for anyway?
Stochastic Fairness Queuing.
I've found a nice picture and description of it:
http://opalsoft.net/qos/DS-25.htm
>
> ACK.
>
>> ---
>> src/util/virnetdevbandwidth.c | 9 +++++++++
>> 1 files changed, 9 insertions(+), 0 deletions(-)
>>
>> diff --git a/src/util/virnetdevbandwidth.c b/src/util/virnetdevbandwidth.c
>> index bddb788..49fc425 100644
>> --- a/src/util/virnetdevbandwidth.c
>> +++ b/src/util/virnetdevbandwidth.c
>> @@ -103,6 +103,15 @@ virNetDevBandwidthSet(const char *ifname,
>>
>> virCommandFree(cmd);
>> cmd = virCommandNew(TC);
>> + virCommandAddArgList(cmd, "qdisc", "add", "dev", ifname, "parent",
>> + "1:1", "handle", "2:", "sfq", "perturb",
>> + "10", NULL);
>> +
>> + if (virCommandRun(cmd, NULL) < 0)
>> + goto cleanup;
>> +
>> + virCommandFree(cmd);
>> + cmd = virCommandNew(TC);
>> virCommandAddArgList(cmd,"filter", "add", "dev", ifname, "parent",
>> "1:0", "protocol", "ip", "handle", "1", "fw",
>> "flowid", "1", NULL);
>
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