Date: Sat, 2 Apr 2016 10:55:03 +0200 From: "O. Hartmann" <ohartman@zedat.fu-berlin.de> To: Cy Schubert <Cy.Schubert@komquats.com> Cc: Michael Butler <imb@protected-networks.net>, "K. Macy" <kmacy@freebsd.org>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: CURRENT slow and shaky network stability Message-ID: <20160402105503.7ede5be1.ohartman@zedat.fu-berlin.de> In-Reply-To: <201604020807.u3287tgc034452@slippy.cwsent.com> References: <56F6C6B0.6010103@protected-networks.net> <201604020807.u3287tgc034452@slippy.cwsent.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--Sig_/VIBPN0rbNwuyJuk=dxEGA+U Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Am Sat, 02 Apr 2016 01:07:55 -0700 Cy Schubert <Cy.Schubert@komquats.com> schrieb: > In message <56F6C6B0.6010103@protected-networks.net>, Michael Butler writ= es: > > -current is not great for interactive use at all. The strategy of > > pre-emptively dropping idle processes to swap is hurting .. big time. = =20 >=20 > FreeBSD doesn't "preemptively" or arbitrarily push pages out to disk. LRU= =20 > doesn't do this. >=20 > >=20 > > Compare inactive memory to swap in this example .. > >=20 > > 110 processes: 1 running, 108 sleeping, 1 zombie > > CPU: 1.2% user, 0.0% nice, 4.3% system, 0.0% interrupt, 94.5% idle > > Mem: 474M Active, 1609M Inact, 764M Wired, 281M Buf, 119M Free > > Swap: 4096M Total, 917M Used, 3178M Free, 22% Inuse =20 >=20 > To analyze this you need to capture vmstat output. You'll see the free po= ol=20 > dip below a threshold and pages go out to disk in response. If you have=20 > daemons with small working sets, pages that are not part of the working=20 > sets for daemons or applications will eventually be paged out. This is no= t=20 > a bad thing. In your example above, the 281 MB of UFS buffers are more=20 > active than the 917 MB paged out. If it's paged out and never used again,= =20 > then it doesn't hurt. However the 281 MB of buffers saves you I/O. The=20 > inactive pages are part of your free pool that were active at one time bu= t=20 > now are not. They may be reclaimed and if they are, you've just saved mor= e=20 > I/O. >=20 > Top is a poor tool to analyze memory use. Vmstat is the better tool to he= lp=20 > understand memory use. Inactive memory isn't a bad thing per se. Monitor= =20 > page outs, scan rate and page reclaims. >=20 >=20 I give up! Tried to check via ssh/vmstat what is going on. Last lines befor= e broken pipe: [...] procs memory page disks faults cpu r b w avm fre flt re pi po fr sr ad0 ad1 in sy cs us s= y id 22 0 22 5.8G 1.0G 46319 0 0 0 55721 1297 0 4 219 23907 5400 95= 5 0 22 0 22 5.4G 1.3G 51733 0 0 0 72436 1162 0 0 108 40869 3459 93= 7 0 15 0 22 12G 1.2G 54400 0 27 0 52188 1160 0 42 148 52192 4366 91= 9 0 14 0 22 12G 1.0G 44954 0 37 0 37550 1179 0 39 141 86209 4368 88= 12 0 26 0 22 12G 1.1G 60258 0 81 0 69459 1119 0 27 123 779569 704359 = 87 13 0 29 3 22 13G 774M 50576 0 68 0 32204 1304 0 2 102 507337 484861 = 93 7 0 27 0 22 13G 937M 47477 0 48 0 59458 1264 3 2 112 68131 44407 95= 5 0 36 0 22 13G 829M 83164 0 2 0 82575 1225 1 0 126 99366 38060 89= 11 0 35 0 22 6.2G 1.1G 98803 0 13 0 121375 1217 2 8 112 99371 4999 8= 5 15 0 34 0 22 13G 723M 54436 0 20 0 36952 1276 0 17 153 29142 4431 95= 5 0 Fssh_packet_write_wait: Connection to 192.168.0.1 port 22: Broken pipe This makes this crap system completely unusable. The server (FreeBSD 11.0-C= URRENT #20 r297503: Sat Apr 2 09:02:41 CEST 2016 amd64) in question did poudriere bul= k job. I can not even determine what terminal goes down first - another one, much more t= ime idle than the one shwoing the "vmstat 5" output, is still alive!=20 i consider this a serious bug and it is no benefit what happened since this= "fancy" update. :-( --Sig_/VIBPN0rbNwuyJuk=dxEGA+U Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJW/4jnAAoJEOgBcD7A/5N8/d4IAJRwHWmiFPl6q7qSNwibPdkO NsTXGXHKjQQb1l33PHzWhnsmVEXLGBlEpJrVNosVUDv1W7rlWdgG8LjgbF4/WaB7 eHXNFNPl39bCg3CZ3+JlHnBxBMfxi0LJ4vuM2pm5/h8eNdEXedP8KxdZrsOWS5gs w/WGxSban1pFS1ftvQoRP/zh7WsW84hlJ+XP5i9ufTfu1gE4DMm0Uan9ivf+PirS X0jhw0/z5/KnOV0QuTdtHWY6O1iO7+8D+Dt6/Y6sTru3r+PYbBPdZp+SeN+phtY4 pUjj2dbNYs2mwVHavpCLoaD/NrfYpYA81EKrMcFCFu3Q8Y6phKKAVxJxEGl1aaM= =ND/8 -----END PGP SIGNATURE----- --Sig_/VIBPN0rbNwuyJuk=dxEGA+U--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20160402105503.7ede5be1.ohartman>