Hi all, I'm trying to verify that there are no concurrency issues with an approach I'm using cpu_id as a key to a HASH_MAP. My understanding is that bcc disables preemption but the details are fuzzy a

Hi All, We have the bi-weekly phone conference scheduled for two days from now, does anybody have a discussion topic to add to the agenda? As a reminder, we are planning to hold the meeting only if ag

Hi All, We have the bi-weekly phone conference scheduled for two days from now, does anybody have a discussion topic to add to the agenda? As a reminder, we are planning to hold the meeting only if ag

Hi all, I attach an XDP prog(SKB mode) to host net device(enp0s9) and the prog will redirect packet to veth device. If there's only veth device, I can redirect packet into netns through veth device in

Hi all, Recently I've been testing with ebpf sockmap. I know that after setting the sock fd in sockmap, the data send to this socket can redirect to another socket that register in the sockmap. I rewr

Hi Yonghong, I had time yesterday to finish the code to avoid using getname_kernel , self-tests run ok with expected results. Here is the current code to avoid the getname_kernel call. diff --git a/ke

As a bpf program cannot sleep, I needed to add a spinlock to kern_path, as it calls getname_kernel() which may sleep. The inode is accessed directly, as we are just interested in the inode's s_dev. Le

Hi, Is it possible to have 2 processes each with its own AF_XDP socket and its own UMEM? Thanks, Kanthi

Hi all, I define a BPF_MAP_TYPE_PERCPU_ARRAY and use it to count packets in the xdp program. When I read the map from userspace program, I find that the entry number doesn't match local CPU numbers. I

Hi All, We have the bi-weekly phone conference scheduled for two days from now, does anybody have a discussion topic to add to the agenda? As a reminder, we are planning to hold the meeting only if ag

Raghavendra Rao reported that memleak does not display proper name of the related kernel module, but just the "kernel" string, like here for xfs module functions: 131072 bytes in 4 allocations from st

I'm playing with bcc to prototype an UDP load balancer. I'm facing an issue that I didn't succeed to understand... In my code I tried to validate my UDP packet using code like this : struct udphdr *ud

G'Day, Many of you already know (and have been helping, thanks) and we've discussed this on the iovisor call before: my book is finally launched properly. Some URLs: http://www.brendangregg.com/blog/2

This is a call for proposals for the BPF micro-conference at this years' Linux Plumbers Conference (LPC) 2019 which will be held in Lisbon, Portugal for September 9-11. The goal of the BPF micro-confe

Hi, Can anyone help me with an example of a GO-bpf program using TC Thanks, Kanthi

Hi All, As per the discussion from last meeting, this week's meeting will be provisional on having a proposed agenda rather than free-form. Therefore, please reply if there is a topic that you would l

We just released bpftrace v0.9.1. This turned into a pretty big release, with almost 200 commits and 3 months since v0.9.0. We'll try to have smaller development cycles for the next releases. Some hig

In https://lists.iovisor.org/g/iovisor-dev/topic/how_to_make_redirect_map/31867035 I have built up an environment to make veth+XDP work. There're some question when I do some performance test 1. When

G'Day, This is the biggest change afoot to the bpftrace API, and I think we can sort it out quickly without fuss, but it is worth sharing here. This is from https://github.com/iovisor/bpftrace/issues/

Following on from the call... Does this sound even better? (mapping from the JVM for comparison): The JVM is a specification of a virtual machine that runs Java bytecode. It is implemented by a Java R