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https://issues.apache.org/jira/browse/TS-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14509160#comment-14509160
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Susan Hinrichs commented on TS-3547:
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I think I see why the system isn't coalescing SSL_write blocks. We call
SSL_write from SSLWriteBuffer() in SSLUtils.c After the SSL_write, we call
BIO_flush, which I assume will force out a packet.
Instead, we should move the BIO_flush call to the end of
SSLNetVConnection::load_buffer_and_write() after all the queued up blocks have
been written via SSLWriteBuffer.
I'll experiment on my own with this, but since [~jacksontj] can exercise this
problem at will, thought you might want to experiment in parallel.
> SSLNetVConnection: switch to a vectored write
> ---------------------------------------------
>
> Key: TS-3547
> URL: https://issues.apache.org/jira/browse/TS-3547
> Project: Traffic Server
> Issue Type: Bug
> Reporter: Thomas Jackson
>
> UnixNetVConnection does a vectored write which bunches blocks together until
> the outgoing buffer will fill up. This means we can better fill the packets,
> and should give us a bit of a performance boost to SSL writes.
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