svn commit: r344368 - head/sys/netinet
Michael Tuexen
tuexen at freebsd.org
Thu Feb 21 22:03:54 UTC 2019
> On 21. Feb 2019, at 09:32, Kubilay Kocak <koobs at FreeBSD.org> wrote:
>
> On 21/02/2019 5:03 am, Michael Tuexen wrote:
>> Author: tuexen
>> Date: Wed Feb 20 18:03:43 2019
>> New Revision: 344368
>> URL: https://svnweb.freebsd.org/changeset/base/344368
>> Log:
>> Reduce the TCP initial retransmission timeout from 3 seconds to
>> 1 second as allowed by RFC 6298.
>> Reviewed by: kbowling@, Richard Scheffenegger
>> Sponsored by: Netflix, Inc.
>> Differential Revision: https://reviews.freebsd.org/D18941
>> Modified:
>> head/sys/netinet/tcp_syncache.c
>> head/sys/netinet/tcp_timer.h
>> Modified: head/sys/netinet/tcp_syncache.c
>> ==============================================================================
>> --- head/sys/netinet/tcp_syncache.c Wed Feb 20 17:56:38 2019 (r344367)
>> +++ head/sys/netinet/tcp_syncache.c Wed Feb 20 18:03:43 2019 (r344368)
>> @@ -159,7 +159,7 @@ static int syncookie_cmp(struct in_conninfo *inc, str
>> * tcp_backoff[1] +
>> * tcp_backoff[2] +
>> * tcp_backoff[3]) + 3 * tcp_rexmit_slop,
>> - * 3000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 45600 ms,
>> + * 1000 ms * (1 + 2 + 4 + 8) + 3 * 200 ms = 15600 ms,
>> * the odds are that the user has given up attempting to connect by then.
>> */
>> #define SYNCACHE_MAXREXMTS 3
>> Modified: head/sys/netinet/tcp_timer.h
>> ==============================================================================
>> --- head/sys/netinet/tcp_timer.h Wed Feb 20 17:56:38 2019 (r344367)
>> +++ head/sys/netinet/tcp_timer.h Wed Feb 20 18:03:43 2019 (r344368)
>> @@ -77,7 +77,7 @@
>> #define TCPTV_MSL ( 30*hz) /* max seg lifetime (hah!) */
>> #define TCPTV_SRTTBASE 0 /* base roundtrip time;
>> if 0, no idea yet */
>> -#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */
>> +#define TCPTV_RTOBASE ( 1*hz) /* assumed RTO if no info */
>> #define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */
>> #define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */
>> _______________________________________________
>
> Any way this can be a run-time tunable?
Will implement this and add you to the review.
Best regards
Michael
>
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