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[tcp] Always set PUSH flag on TCP transmissions

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Apparently this can cause a major speedup on some iSCSI targets, which
will otherwise wait for a timer to expire before responding.  It
doesn't seem to hurt other simple TCP test cases (e.g. HTTP
downloads).

Problem and solution identified by Shiva Shankar <802.11e@gmail.com>
This commit is contained in:
Michael Brown
2009-01-21 04:22:34 +00:00
parent 6941793416
commit cf53998901
1 changed files with 1 additions and 1 deletions
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2
src/net/tcp.c
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@@ -478,7 +478,7 @@ static int tcp_xmit ( struct tcp_connection *tcp, int force_send ) {
tcphdr->seq = htonl ( tcp->snd_seq ); tcphdr->seq = htonl ( tcp->snd_seq );
tcphdr->ack = htonl ( tcp->rcv_ack ); tcphdr->ack = htonl ( tcp->rcv_ack );
tcphdr->hlen = ( ( payload - iobuf->data ) << 2 ); tcphdr->hlen = ( ( payload - iobuf->data ) << 2 );
tcphdr->flags = flags; tcphdr->flags = ( flags | TCP_PSH );
tcphdr->win = htons ( tcp->rcv_win ); tcphdr->win = htons ( tcp->rcv_win );
tcphdr->csum = tcpip_chksum ( iobuf->data, iob_len ( iobuf ) ); tcphdr->csum = tcpip_chksum ( iobuf->data, iob_len ( iobuf ) );