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https://issues.apache.org/jira/browse/LOG4NET-415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866321#comment-13866321
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Dongsheng Song commented on LOG4NET-415:
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Here is the test result:
{quote}
C:\>MessageLostTest.exe
Use Non-Blocking send 100000 message, 3733 failed (3.73 %), use 1.396 seconds.
C:\>MessageLostTest.exe
Use Non-Blocking send 100000 message, 5912 failed (5.91 %), use 1.458 seconds.
C:\>MessageLostTest
Use Non-Blocking send 100000 message, 7237 failed (7.24 %), use 1.382 seconds.
C:\>MessageLostTestAsync
Use BeginSend send 100000 message, 0 failed (.00 %), use 2.576 seconds.
C:\>MessageLostTestAsync
Use BeginSend send 100000 message, 0 failed (.00 %), use 3.470 seconds.
C:\>MessageLostTestAsync
Use BeginSend send 100000 message, 0 failed (.00 %), use 3.273 seconds.
{quote}
>From the test result, we can see use BeginSend is the best choice.
If we can do the best, why not ?
> RemoteSyslogAppender may block for ARP resolution + Improvement Strict RFC3164
> ------------------------------------------------------------------------------
>
> Key: LOG4NET-415
> URL: https://issues.apache.org/jira/browse/LOG4NET-415
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.13
> Environment: Any Windows environment
> Reporter: Jose Luis Pedrosa
> Labels: RemoteSyslogAppender
> Attachments: LOG4NET-415.patch, MessageLostTest.cs,
> MessageLostTest.cs, MessageLostTestAsync.cs, RemoteSyslogNonBlockingv2.patch
>
>
> Sending UDP packages may block for some time in specific circumstances:
> 1) Next hop in network level 3 can't be resolved by ARP.
> 2) Datagram size exceeds FastSendDatagramThreshold configured size.
> When sending packets bigger than FastSendDatagramThreshold, the OS waits
> until the packet is actually sent, if the If the syslog (or the next hop to
> reach the syslog) is in the same VLAN/Subnet the OS tries to resolve by ARP
> the Ip of the configured syslog, this may take up to 3 seconds, slowing down
> the whole application, which in some cases can lead to outages (timeouts, DB
> locks...).
> Also the fact that each carriage return generates the headers of the packet
> again, that can lead to a significant overhead in some scenarios, for
> instance when loggign HTTP requests to a remote syslog, every header will go
> in a different message. Also some logging may require characters that are now
> skipped in patch: https://issues.apache.org/jira/browse/LOG4NET-370
> I'm adding a patch that
> 1) Moves the use of UDPClient to Non blocking sockets, which eliminates the
> blocking.
> 2) Adds a configuration field to decide if you want Strict RFC Behaviour or
> not (with default Strict).
> Please your feedback, thanks in advance
> Jose Luis
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