search for: dequeueing

I read the sched/qdiscs code from kernel source ... and I have some questions : When the .enqueue, .dequeue, .drop, .requeue functions are called ? What is the event that triggers them and how often this event apears ( per second ? ) ? When a qdisc is dequeued ( when it''s limit is reached ) ? Thanks _______________________________________________ LARTC mailing list /

I notice one other small problem with my modified version of SFQ. The fact that packets can be dropped at dequeue time is incompatible with the way HTB (and probably CBQ and others modeled on it) keep statistics. When I fill a low rate queue causing packets to expire and be dropped at dequeue I get interesting statistics like this: This is my variant of SFQ qdisc plfq 8016: dev eth1 ... Sent

I''ve been reading the Linux Advanced Routing & Traffic Control Howto and it''s well put together but I''ve a few questions about the mechanism. I dont'' think that I''d have any questions if I just wanted to know how to configure the Shaping method but I''m trying to get into the nuts and bolts. Basically I''m trying to find out the

On Thursday, July 18, 2019 8:24 PM, Michael S. Tsirkin wrote: > /* > * balloon_page_alloc - allocates a new page for insertion into the balloon > - * page list. > + * page list. > * > - * Driver must call it to properly allocate a new enlisted balloon page. > - * Driver must call balloon_page_enqueue before definitively removing it > from > - * the guest

From: Wei Wang <wei.w.wang at intel.com> A #GP is reported in the guest when requesting balloon inflation via virtio-balloon. The reason is that the virtio-balloon driver has removed the page from its internal page list (via balloon_page_pop), but balloon_page_enqueue_one also calls "list_del" to do the removal. This is necessary when it's used from balloon_page_enqueue_list,

There is an design problem with the qdisc interface that causes qlen related bugs in netem, tbf, and other qdisc''s that peek at the top of the queue. The problem is that requeue needs to be called from the dequeue function but requeue can fail. If requeue fails, then the calling qdisc can not properly handle the error. If it returns NULL, then the parent''s expectation about qlen

Hi, I''m adding a queuing disc. inside kernel. I am confused that it seems few other qdiscs allocate memory dynamically. Is it invalid to use memory calls like molloc or just a suggest that do not use it often? Thanks for your help. bon ----------------------------------------------------------------- < 每天都 Yahoo!奇摩 > www.yahoo.com.tw

From: Wei Wang <wei.w.wang at intel.com> A #GP is reported in the guest when requesting balloon inflation via virtio-balloon. The reason is that the virtio-balloon driver has removed the page from its internal page list (via balloon_page_pop), but balloon_page_enqueue_one also calls "list_del" to do the removal. This is necessary when it's used from balloon_page_enqueue_list,

Hello, I think the BUG_TRAP() in the htb_dequeue_tree() is wrong. First it checks if the class pointer "cl" is NULL, which is obviously right. But I do not understand why we also check whenever the queue length of the leaf queue is zero "cl->un.leaf.q->q.qlen". I would have put that in the expression of the "if" statements that comes afterwards. A queue

Hi, Does the ''tc'' tool show dequeue statistics? If so what switches does one use to see this. If not which is the best way to see these statistics? Thanks.

Hi all. I''m quite new to the concepts of the "traffic control" framework, and I''ve got a programming-related question. Hopefully someone has the answer... Is it possible, either for the device driver itself or for a userspace program, to get information about how many packets are currently queued for a given network interface? Let''s describe it a little

Hello All Its first time i posting to this mail list :). I have done something (maybe) important. I write new IMQ device driver based from Martin Devera and Patrick McHardy implementation with device EOS support. My current implementation supporting only egress trafic shaping and kernel 2.4.25. For more details, source and examples have look at my page http://hyperfighter.jinak.cz/qos Ill

Lots of comments bitrotted. Fix them up. Fixes: 418a3ab1e778 (mm/balloon_compaction: List interfaces) Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- mm/balloon_compaction.c | 73 +++++++++++++++++++++++------------------ 1 file changed, 41 insertions(+), 32 deletions(-) diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index d25664e1857b..9cb03da5bcea 100644 ---

Lots of comments bitrotted. Fix them up. Fixes: 418a3ab1e778 (mm/balloon_compaction: List interfaces) Reviewed-by: Wei Wang <wei.w.wang at intel.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- fixes since v3: teaks suggested by Wei mm/balloon_compaction.c | 71 ++++++++++++++++++++++------------------- 1 file changed, 39 insertions(+), 32 deletions(-) diff --git

From: Wei Wang <wei.w.wang at intel.com> A #GP is reported in the guest when requesting balloon inflation via virtio-balloon. The reason is that the virtio-balloon driver has removed the page from its internal page list (via balloon_page_pop), but balloon_page_enqueue_one also calls "list_del" to do the removal. This is necessary when it's used from balloon_page_enqueue_list,

Hello everyone, We are working on HTB with TC and would like some clarifications from your part. Our example is as follows. We have one HTB root class and two HTB classes attached to it, as in this figure : 1: HTB | | |

I set up a little test to see what the behaviour of (e)sfq was - because I couldn''t work it out from the source :-) . I wanted to see where from a slot the packets got dropped when the queue was full. (e)sfq drops from the longest slot to make space for an incoming packet, so it''s not tail drop as such, but the results show me it does drop from the tail of the slot - which

Signed-off-by: Jason Wang <jasowang at redhat.com> --- include/linux/ptr_ring.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index 6c70444..4771ded 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -247,6 +247,22 @@ static inline void *__ptr_ring_consume(struct

Hello! On 3/21/2017 7:04 AM, Jason Wang wrote: > Signed-off-by: Jason Wang <jasowang at redhat.com> > --- > include/linux/ptr_ring.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 65 insertions(+) > > diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h > index 6c70444..4771ded 100644 > --- a/include/linux/ptr_ring.h > +++

Hello! On 3/21/2017 7:04 AM, Jason Wang wrote: > Signed-off-by: Jason Wang <jasowang at redhat.com> > --- > include/linux/ptr_ring.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 65 insertions(+) > > diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h > index 6c70444..4771ded 100644 > --- a/include/linux/ptr_ring.h > +++