Thanks Florin,
I set LDP_SID_BIT to 10 to support more cut-through sessions, but it seems that this configuration conflicts with the FD_SETSIZE check in ldp_init().
In addition, I would like to know are there any obstacles to allocate multiple fifo pairs in one segment like non-cutthrough connection ?
Best Regard,
Yacan
On 2/27/2021 03:48，Florin Coras<fcoras.li...@gmail.com> wrote：
Hi Yacan,Unfortunately what you found is a known scale (and somewhat performance) limitation for cut-through sessions. There is a plan to alleviate that by allocating per app pair segments (as opposed to per connection) but no ETA for it. If anybody else is interested in tackling this, let me know and I’ll be glad to provide some guidance.In the interim, set the LDP_SID_BIT env variable to something larger to set aside more fds for linux.Regards,FlorinOn Feb 25, 2021, at 11:51 PM, liuyacan <liuya...@corp.netease.com> wrote:Hi there,We are trying to use VPP cut-through feature (version 20.09). What confuses me is why separate fifo segments are used for each connection ? In our case, we establish a lot of cut-through connections, and we find that VPP send a lot of file descriptors to VCL ( we use memfd ). Since we set LDP_SID_BIT to 9, does this mean that we can only establish up to N (N < 512) cut-through connections ?Any suggestion ?Best RegardsYacan
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