Hi Eugene
Thank for your reply
On 30/12/2020 02:13, Eugene Grosbein wrote:
29.12.2020 23:36, Victor Gamov wrote:
Please do not top-post.
Thanks.
On 30/11/2020 18:33, Victor Gamov wrote:
Hi All
Can somebody help me to get UDP 'dropped due to full socket buffers' by SNMP?
Is it possible? Now I'm getting it with
`netstat -n -p udp -f inet -s`
but SNMP will be more useful for remote monitoring.
And one more question about 'dropped due to full socket buffers': how to avoid
it? Which params must be tuned?
Both problems generally mean that outgoing link for that UDP packets is
congested,
so socket buffers start to fill until they are full.
What is "media" for that UDP data - some syntetic tunnel or plain ethernet link
or something else?
It's 10G Intel card (via ix driver) attached to D-Link switch
This Host-A got many multicast UDP streams via many VLANs and resend
streams to one VLAN-750 (mainly). Every multicast serviced by its own
process.
Interface utilization about 1Gbit/s for receive and 800Mbit/s for transmit.
You may find useful this old thread dealing with similar problem:
http://freebsd.1045724.x6.nabble.com/SNMP-No-Bufferspace-td6333081.html
Thanks for this link.
'vmstat -i | grep ix0' output followed:
=====
irq264: ix0:rxq0 90527644527 21675
irq265: ix0:rxq1 95793018351 22936
irq266: ix0:rxq2 96075009541 23004
irq267: ix0:rxq3 93444280619 22374
irq268: ix0:aq 3 0
=====
'netstat -idnh -W' show no errs/drops
'netstat -m'
=====
12525/7470/19995 mbufs in use (current/cache/total)
12484/4766/17250/1005602 mbuf clusters in use (current/cache/total/max)
158/1866 mbuf+clusters out of packet secondary zone in use (current/cache)
0/116/116/502800 4k (page size) jumbo clusters in use
(current/cache/total/max)
0/0/0/148978 9k jumbo clusters in use (current/cache/total/max)
0/0/0/83800 16k jumbo clusters in use (current/cache/total/max)
28099K/11863K/39962K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters delayed (4k/9k/16k)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0 sendfile syscalls
0 sendfile syscalls completed without I/O request
0 requests for I/O initiated by sendfile
0 pages read by sendfile as part of a request
0 pages were valid at time of a sendfile request
0 pages were valid and substituted to bogus page
0 pages were requested for read ahead by applications
0 pages were read ahead by sendfile
0 times sendfile encountered an already busy page
0 requests for sfbufs denied
0 requests for sfbufs delayed
======
Currently I'm thinking about ethernet flow control: Host-B connected to
VLAN-750 on the third switch has 1G link (via igb driver) and both
Host-A and Host-B has fc=3. So when Host-B get microburst it can send
PAUSE and Host-A start to fill queue. But FC disabled for all switches
and I'm not sure about PAUSE can be propagated from Host-A to Host-B
--
CU,
Victor Gamov
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