Date: Sun, 14 Sep 2014 10:07:28 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Status update - ZFS "stalls" and other misbehavior Message-ID: <5415AF30.9060209@denninger.net>
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[-- Attachment #1 --] Those of you who have seen misbehavior of various sorts while running -STABLE w/ZFS filesystems may want to check out the developments in this thread on Bugzilla. Work has continued on the candidate patch I posted back in March, and I recently put forward an updated version incorporating changes made by Steve as well that, at least in my testing and (thus far) on one production system here, have completely eliminated the problem. More eyes looking at it and running it down are obvious better so if you have an interest in this issue or have had problems in this area (/*especially*/ if you have had system "stalls") please check it out. Those who are using my previous patch from back in March definitely want to look at this; while the March changes did largely fix the issue they did so by moving the "danger zone" further out but did not prevent the ZFS code from invading system RAM to the point that it could produce stalls -- it just made it much less likely. The most-recent patch, as far as I've been able to determine, completely prevent it even when the system is severely overstressed in terms of demanded I/O rate or when the target pool is compromised (e.g. during a resilver operation.) Thanks. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594 -- Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ [-- Attachment #2 --] 0 *H 01 0 + 0 *H O0K030 *H 01 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 130824190344Z 180823190344Z0[1 0 UUS10UFlorida10UKarl Denninger1!0 *H karl@denninger.net0"0 *H 0 bi՞] MNԿawx?`)'ҴcWgR@BlWh+ u}ApdCF JVй~FOL }EW^bچYp3K& ׂ(R lxڝ.xz?6 &nsJ +1v9 v/( kqĪp[vjcK%fϻe?iq]z lyzFO'ppdX//Lw(3 JI A*S#՟H[f|CGqJKoo y.oEuOw$ /섀$삻J9b|A P~8]D1YI<"""Y^T2iQ2 b yH)] Ƶ0y$ _N 6XqMC 9 XgώjGTP"#nˋ"Bk1 00 U 0 0 `HB0 U 0, `HB OpenSSL Generated Certificate0 U |8 ˴d[20 U #0]Af4 U3x&^"408 `HB+)https://cudasystems.net:11443/revoked.crl0 *H gBwH] j\x`( &gW32"Uf^. ^Iϱ k!DQA g{(w /)\N'[ oRW @C HO>)XrTNɘ!u`xt5(=f\-l3<@C6mnhv##1ŃbH͍_Nq aʷ?rk$^9TIa!kh,D -ct1 0001 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 + ;0 *H 1 *H 0 *H 1 140914150728Z0# *H 1P} Q2 Aɚu'' :0l *H 1_0]0 `He*0 `He0 *H 0*H 0 *H @0+0 *H (0 +71001 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 *H 101 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 *H <D#,T58KϾ 4|UFyB)%հUbvo [ P?o-4Jf.@JNQNU8"lQ$ ~% 两-m%Vi-|[݂vF%=rڄe)麆)Ed: WbZ=kq홦q\/uqP(3kS +}D;9"Y$:\ͺYyQ183^ZP_9Mz<5 5N?yy &4F)+=.RKԞ"y Cg_08}١zťݶͯbnW}-q_'w꥓ґ+kk5X{:_|!.VH%ѰQc٘F/ OÈA SO>W6EIgR ̓#IzN+5. 55VW+R_CZ*R꾿䦝'z
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