On Thu, Apr 4, 2024 at 2:36 AM Eelco Chaudron <echau...@redhat.com> wrote:

>
>
> On 3 Apr 2024, at 23:18, Ihar Hrachyshka wrote:
>
> > Before the patch, the size of the backlog depended on the type of socket
> > (UNIX vs INET) as well as on the language (C vs Python), specifically:
> >
> > - python used backlog size = 10 for all sockets;
> > - C used 64 for UNIX sockets but 10 for INET sockets.
> >
> > This consolidates the values across the board. It effectively bumps the
> > number of simultaneous connections to python unixctl servers to 64. Also
> > for INET C servers too.
> >
> > Signed-off-by: Ihar Hrachyshka <ihrac...@redhat.com>
>
> Hi Ihar,
>
> Thanks for submitting the patch. The patch looks fine to me, however, can
> you elaborate on why you want to increase the size to 64? Is 10 giving
> problems in specific scenarios?
>
>
I guess I should've included it in the commit message, (and I am happy to
send v2 with it updated), but...

1. Originally* the patch was implemented to allow more parallel fmt_pkt
calls in OVN test suite (that rely on a python AF_UNIX unixctl server to
transform scapy string format strings into byte strings). The problem with
parallel handling of more than 10 unixctl AF_UNIX requests to python
servers was noticed here:
https://github.com/ovn-org/ovn/commit/0baca3e519756cbe98a32526ccc637bb73468743
2. Now, Brian also reports listen backlog issues in OpenStack environments
for INET sockets, see:
https://mail.openvswitch.org/pipermail/ovs-discuss/2024-April/053049.html

* the patch was part of a series of patches -
https://patchwork.ozlabs.org/project/openvswitch/list/?series=382739&state=%2A&archive=both
- that generally improve AF_UNIX unixctl socket handling, which I plan to
revive later, but nothing stops us from merging this before I get to it.


> Cheers,
>
> Eelco
>
> Acked-by: Eelco Chaudron <echau...@redhat.com>
>
>
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