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author | dillon <dillon@FreeBSD.org> | 2002-08-25 01:51:57 +0000 |
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committer | dillon <dillon@FreeBSD.org> | 2002-08-25 01:51:57 +0000 |
commit | caeb11da290a94f94ca5bdc8faf82d71e0599643 (patch) | |
tree | cfdb5e8a638d76ecbd70af1f8004ebd7b5e4f451 /share | |
parent | e378e8ab0a00f6af2ec66ef51b2334ca1c414427 (diff) | |
download | FreeBSD-src-caeb11da290a94f94ca5bdc8faf82d71e0599643.zip FreeBSD-src-caeb11da290a94f94ca5bdc8faf82d71e0599643.tar.gz |
Add A section on the retransmit timer sysctls.
MFC after: 3 days
Diffstat (limited to 'share')
-rw-r--r-- | share/man/man4/tcp.4 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index c8a942f..24e2e81 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -300,6 +300,19 @@ no reseeding will occur. Reseeding should not be necessary, and will break .Dv TIME_WAIT recycling for a few minutes. +.It tcp.inet.tcp.rexmit_{min,slop} +Adjust the retransmit timer calculation for TCP. The slop is +typically added to the raw calculation to take into account +occassional variances that the SRTT (smoothed round trip time) +is unable to accomodate, while the minimum specifies an +absolute minimum. While a number of TCP RFCs suggest a 1 +second minimum these RFCs tend to focus on streaming behavior +and fail to deal with the fact that a 1 second minimum has severe +detrimental effects over lossy interactive connections, such +as a 802.11b wireless link, and over very fast but lossy +connections for those cases not covered by the fast retransmit +code. For this reason we use 200ms of slop and a near-0 +minimum, which gives us an effective minimum of 200ms (similar to Linux). .It tcp.inflight_enable Enable .Tn TCP |