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windows: implement send buffer tuning

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Significantly enhances upload performance on modern Windows versions.

Bug: https://curl.haxx.se/mail/lib-2018-07/0080.html
Closes #2762
Fixes #2224
This commit is contained in:
Daniel Jelinski 2018-07-19 14:07:59 +02:00 committed by Daniel Stenberg
parent 298d2565e2
commit 1ba1dba76a
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 18 additions and 1 deletions
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19
lib/transfer.c
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@ -869,6 +869,22 @@ static CURLcode done_sending(struct connectdata *conn,
return CURLE_OK;
}
#if defined(WIN32) && defined(SIO_IDEAL_SEND_BACKLOG_QUERY)
static void win_update_buffer_size(curl_socket_t sockfd)
{
int result;
ULONG ideal;
DWORD ideallen;
result = WSAIoctl(sockfd, SIO_IDEAL_SEND_BACKLOG_QUERY, 0, 0,
&ideal, sizeof(ideal), &ideallen, 0, 0);
if(result == 0) {
setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF,
(const char *)&ideal, sizeof(ideal));
}
}
#else
#define win_update_buffer_size(x)
#endif
/*
* Send data to upload to the server, when the socket is writable.
@ -1020,10 +1036,11 @@ static CURLcode readwrite_upload(struct Curl_easy *data,
k->upload_fromhere, /* buffer pointer */
k->upload_present, /* buffer size */
&bytes_written); /* actually sent */
if(result)
return result;
win_update_buffer_size(conn->writesockfd);
if(data->set.verbose)
/* show the data before we change the pointer upload_fromhere */
Curl_debug(data, CURLINFO_DATA_OUT, k->upload_fromhere,