, 2014 11:21 AM
> To: Rustad, Mark D
> Cc: Ronciak, John; e1000-devel@lists.sourceforge.net
> Subject: Re: [E1000-devel] Bringing down igb interface causes 200ms
> latency in unrelated processes
>
> Yes, I think that's the issue. With our 20ms timeslots it was taking
>
On Wed, Mar 26, 2014 at 3:59 PM, Rustad, Mark D wrote:
> I don't have any experience with the igb driver myself, but a quick look
> shows that it is only taking the rtnl lock in two places, and those probably
> are not your issue. It would be nice if the rtnl lock were to be broken down
> into
On Mar 26, 2014, at 3:36 PM, Aaron Brice wrote:
> Well, I got past the ioctl part but it seems that we're also doing
> some QoS stuff using netlink sockets that is getting delayed also, and
> I can't get rid of the rtnl lock there.. Is there anything that can
> be done on the driver side? 200ms
Well, I got past the ioctl part but it seems that we're also doing
some QoS stuff using netlink sockets that is getting delayed also, and
I can't get rid of the rtnl lock there.. Is there anything that can
be done on the driver side? 200ms seems like a long time to be
holding the lock..
Aaron
O
Yes, I think that's the issue. With our 20ms timeslots it was taking
too long to do a bunch of reads so we added an ioctl to the tap driver
to read a bunch of packets into a buffer. I think we can remove the
rtnl lock for this particular ioctl. We didn't see an issue with the
e1000 motherboard i
On Mar 26, 2014, at 10:24 AM, Aaron Brice wrote:
> On Tue, Mar 25, 2014 at 10:39 PM, Ronciak, John
> wrote:
>> How are the different PCIe slots connected into the system? In a lot of
>> cases some of the slots are not all equal in terms of how they are laid out
>> in the system. If you move
On Tue, Mar 25, 2014 at 10:39 PM, Ronciak, John wrote:
> How are the different PCIe slots connected into the system? In a lot of
> cases some of the slots are not all equal in terms of how they are laid out
> in the system. If you move the interface doing the 20ms read to a NIC in a
> differe
> -Original Message-
> From: Aaron Brice [mailto:aaron.br...@gmail.com]
> Sent: Tuesday, March 25, 2014 5:54 PM
> To: e1000-devel@lists.sourceforge.net
> Subject: [E1000-devel] Bringing down igb interface causes 200ms latency
> in unrelated processes
>
> I have
I have a 12 CPU server with 3 4-port 82576 network cards (12 ports
total using igb driver). It's running Debian 7 (3.2 kernel with the
realtime patches).
I have a process on that system that is reading from a virtual tap
interface every 20ms (using boost::asio) and writing udp packets out
one of
