Date: Sun, 12 Sep 2010 19:52:14 -0400 From: jhell <jhell@DataIX.net> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: Swap on ZFS Volume still panics? Message-ID: <4C8D67AE.4030802@DataIX.net> In-Reply-To: <AANLkTi=K=KGTW5spj6qcpjv3qjV%2BDsR4BVw4Wd%2BFq%2Bbt@mail.gmail.com> References: <AANLkTin4DAY%2BWXOpckWJCs437BGg0mjAFzRv%2BiDEG-F1@mail.gmail.com> <20100910073912.GC2007@garage.freebsd.pl> <4C8B2A56.8080809@DataIX.net> <AANLkTi=K=KGTW5spj6qcpjv3qjV%2BDsR4BVw4Wd%2BFq%2Bbt@mail.gmail.com>
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[-- Attachment #1 --] -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 09/12/2010 17:14, App Deb wrote: > I just tried your settings (setting primary and secondary cache to none). > > (also tried it with checksum=off and volblocksize=4k, all together) > > It somewhat helped. In the beginning I though it would deadlock. The system > was inaccessible for ~10 minutes, but after that it managed to allocate the > required swap, and the system resumed. > > I measured the speed that it allocated swap and it was only around ~0.4MB/s > max. With the native freebsd-swap partition the speed using my "selfmade > memory filling program" it almost reaches native disk speeds (~80MB/s). > > I still see a problem here. > I agree, something is definitely amiss here. I created a sparse '-s' or no refreservation zvol of 2g with '-b' of 4k and saw a lot of pressure when it came to heavy swapping that was equal to the same amount of RAM available. While this was happening I was able to get a pretty peculiar crash dump that someone may or may not find useful. I can provide further information on this dump via, core.txt.NN or any other methods needed. backtrace attached. *BEWARE* Pawel, I have uploaded the core.txt.36 file encrypted to your public key at here for further review if you find the backtrace curious: http://bit.ly/cuyH3L Regards, - -- Dump header from device /dev/label/dumpdev Architecture: i386 Architecture Version: 2 Dump Length: 583663616B (556 MB) Blocksize: 512 Dumptime: Sun Sep 12 13:39:25 2010 Hostname: centel.dataix.local Magic: FreeBSD Kernel Dump Version String: FreeBSD 8.1-STABLE #0 r212427M 208:41f4fcc6ce0a Fri Sep 10 17:47:45 EDT 2010 "REST EXCLUDED" Panic String: vm_fault: fault on nofault entry, addr: 828a0000 Dump Parity: 2118336362 Bounds: 36 Dump Status: good jhell,v -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.16 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMjWetAAoJEJBXh4mJ2FR+WqoH/08xRrORHKQiaxKea2D4G6jy iiG2r+Y3Xz632sa0VrNYRSDRtspXTUhR8ZJBPyItgQKcYsoT5WA+GcwN+yj19QlX sDXeNtVTiem0tFIavdiM2/gTIlQJj7F/sny08nQNQcgvyb2SSR/DHKd49o4gyCQG KtzP5Ea04R9Pc/OsPOVV9XNtWL06wxcACOTNRcHOrk7hFOuSku31jv2i+ohquKLV 2EpYYIXoO44hqHzYNDFCOqO4v+Iw72Ys00bitL71pg6+yWVFEYcAl04gNoNzJYud 7hAamvM5zE0Ah63tToEcFbYE0ufFAp4vRBXvEj44TJoHNl5MmCOgAUHQA4K4xjs= =E1EU -----END PGP SIGNATURE----- [-- Attachment #2 --] #1 0x80674c91 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:416 #2 0x80674f25 in panic (fmt=Variable "fmt" is not available.) at /usr/src/sys/kern/kern_shutdown.c:590 #3 0x808c1a4e in vm_fault (map=0x81690000, vaddr=2190082048, fault_type=1 '\001', fault_flags=0) at /usr/src/sys/vm/vm_fault.c:283 #4 0x8091e65b in trap_pfault (frame=0xb45e1a44, usermode=0, eva=2190083976) at /usr/src/sys/i386/i386/trap.c:840 #5 0x8091f15c in trap (frame=0xb45e1a44) at /usr/src/sys/i386/i386/trap.c:533 #6 0x809023bc in calltrap () at /usr/src/sys/i386/i386/exception.s:166 #7 0x808d8f5a in vm_reserv_level_iffullpop (m=0x89099870) at /usr/src/sys/vm/vm_reserv.c:512 #8 0x8091b487 in pmap_enter (pmap=0x84d58620, va=860164096, access=1 '\001', m=0x89099870, prot=3 '\003', wired=0) at /usr/src/sys/i386/i386/pmap.c:3436 #9 0x808c341f in vm_fault (map=0x84d58570, vaddr=860164096, fault_type=1 '\001', fault_flags=Variable "fault_flags" is not available.) at /usr/src/sys/vm/vm_fault.c:945 #10 0x8091e569 in trap_pfault (frame=0xb45e1d38, usermode=1, eva=860164096) at /usr/src/sys/i386/i386/trap.c:828 #11 0x8091efce in trap (frame=0xb45e1d38) at /usr/src/sys/i386/i386/trap.c:401 #12 0x809023bc in calltrap () at /usr/src/sys/i386/i386/exception.s:166 #13 0x30616fde in ?? () [-- Attachment #3 --] Lg WT~6R*8/pp=rzmŧV2Gp.<DZRUxM,C?,uK>-ׇ,Z 9'qaw:"o+mr sjP Y]?qϕY Y'RC! Kn ^G,io#n = 轄= & r >MRP ع%\g LԤWBZ_ ?4MEz>`Q"
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