Grazie mille. I will test it as time allows -- swamped.
Joe Buehler
Vincenzo Maffione wrote:
> Hi,
> This commit (fe13476b106ed1f4b517b1590e1dfb3f268b6e78) in the upstream
> netmap should have fixed the NS_MOREFRAG issue for ixgbe.
> If you happen give a try let us know.
in some of the driver source files but as an MTU, the
max frame size is larger.
Joe Buehler
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as the perfect solution but it works fine for my situation.
Joe Buehler
--- LINUX/ixgbe_netmap_linux.h.~1~ 2018-03-19 12:36:09.1 -0400
+++ LINUX/ixgbe_netmap_linux.h 2018-03-20 14:54:47.1 -0400
@@ -329,7 +329,8 @@
nic_i = netmap_idx_k2n(kring, nm_i);
for (n = 0; nm_i != head; n
length when NS_MOREFRAG is set and have the driver assume that the
buffer is full if that length is more than the buffer length. That way netmap
knows both the total length and the fragment length.
Very ugly but...
Joe Buehler
> I don't think so, but you need to use the latest netmap from git
split TX frames into multiple buffers does not work, the NIC is
sending 2048 byte frames (the buf_size I am using).
I will re-check my code. Do I need a particular version of ixgbevf perhaps?
Joe Buehler
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htt
Sorry, I should have added, this is LINUX if it matters.
Joe Buehler wrote:
> I am having difficulties with netmap over top of ixgbevf when attempting to
> use a large MTU (say 9000 bytes).
>
> Does the ixgbevf driver use 2048 byte buffers for RX regardless of the MTU or
> net
bytes max. It is possible that netmap is passing frames in multiple
pieces I suppose, I haven't checked that yet -- my code is looking at the frame
headers only at the moment so would toss trailing pieces.
Joe Buehler
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to tweak to get past this?
I am using LINUX should it matter.
Joe Buehler
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ial patch to the netmap driver to turn this on and
also pass the timestamp to user space, and will pass on the changes. I
am doing frame latency measurements and this simple change eliminated a
*whole* lot of noise in the measurements.
Joe Bueh
Here is what I start seeing in dmesg when I attempt to use the 4.2.1
ixgbevf driver as modified for netmap.
Joe Buehler
[ 136.607019] 343.712201 [ 189] ixgbe_netmap_configure_srrctl not supported
[ 136.610020] 343.715203 [ 189] ixgbe_netmap_configure_srrctl not supported
[ 136.796698] ixgbevf
version of the driver might be better? The kernel
ixgbevf version is 2.12.1-k while netmap is trying to use 4.2.1.
Looking at the RT patch for LINUX there are only a few network driver
patches, none for the ixgbe* cards.
Joe Buehler
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Decreasing buf_num to 32768 eliminated the allocation failure.
Joe Buehler
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0
[ 857.989543] 620.139199 [ 215] virtio_netmap_clean_used_rings got 0
used bufs on queue rx-0
[ 857.990177] 620.139833 [ 670] virtio_netmap_init_buffers added 255
inbufs on queue 0
Joe Buehler
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on real-time KVM on the net that explains how to achieve
what I want.
Joe Buehler
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on macvtap1 (100,000) and that fixed the drops but
the resulting latency is horrible, increasing with test length, as is
the jitter. Given the low RX thread CPU it would appear that there is
eomething wrong between macvtap and my code. I will have to chew on
this a bit.
RX thread. The frame rate displayed by pkt-gen
and the CPU displayed by top is bouncing around.
Joe Buehler
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that's the basic idea.
>
> ?
> What happens if you use pkt-gen rather than your application?
I was under the impression that I can't have two threads in the netmap
kernel code at the same time so can't do that.
Joe Buehler
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all frames but
it spikes (up to 0.6 mS!) for a few frames, which is not acceptable for
this application -- was expecting much better due to network stack
bypass. And this is just 100 frames/sec...
Joe Buehler
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I am running virtio_net (netmap-modified) on top of netmap (latest) in a
KVM virtual machine. The host adapter is Intel 82599ES 10G and the VM
is connected to it via macvtap.
My test setup is a small program in the VM sending frames out to an
external loopback device and watching what comes
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