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Date: Sun, 15 Jun 2014 01:18:30 -0700 (PDT) From: David Miller <davem@...emloft.net> To: dborkman@...hat.com Cc: netdev@...r.kernel.org, linux-sctp@...r.kernel.org, vyasevich@...il.com Subject: Re: [PATCH net] net: sctp: fix permissions for rto_alpha and rto_beta knobs From: Daniel Borkmann <dborkman@...hat.com> Date: Sun, 15 Jun 2014 00:59:14 +0200 > Commit 3fd091e73b81 ("[SCTP]: Remove multiple levels of msecs > to jiffies conversions.") has silently changed permissions for > rto_alpha and rto_beta knobs from 0644 to 0444. The purpose of > this was to discourage users from tweaking rto_alpha and > rto_beta knobs in production environments since they are key > to correctly compute rtt/srtt. > > RFC4960 under section 6.3.1. RTO Calculation says regarding > rto_alpha and rto_beta under rule C3 and C4: ... > While it is discouraged to adjust rto_alpha and rto_beta > and not further specified how to adjust them, the RFC also > doesn't explicitly forbid it, but rather gives a RECOMMENDED > default value (rto_alpha=3, rto_beta=2). We have a couple > of users relying on the old permissions before they got > changed. That said, if someone really has the urge to adjust > them, we could allow it with a warning in the log. > > Fixes: 3fd091e73b81 ("[SCTP]: Remove multiple levels of msecs to jiffies conversions.") > Signed-off-by: Daniel Borkmann <dborkman@...hat.com> This permission change seemed unintentional, and doesn't make much sense anyways to me. So I'm applying this, thanks Daniel. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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