Date: Wed, 26 Feb 2014 23:40:55 +0000 From: Radu Coroi <coroi_test@yahoo.com> To: freebsd-questions@freebsd.org Subject: slow samba performance even after tuning Message-ID: <824D454A-F316-44AD-B39E-55E85396FEF1@yahoo.com>
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Hi all, My home server is a HP Microserver N40L (spec at = http://n40l.wikia.com/wiki/Base_Hardware_N40L) with 6GB of RAM running = freebsd 10.0 installed on a flash drive. Unfortunately the samba performance is quite bad sitting at 40MBps where = NFS is at 70MBps and 106MBps for FTP on the same test file at 1.5GB on = top of one ZFS file. The poor performance doesn't allow for a full hd = playback. I've tried both samba36 and samba41 and AIO and applied the = recommendations from the = http://lists.freebsd.org/pipermail/freebsd-stable/2011-February/061642.htm= l but still the same results. In the same time smbd process cpu usage never goes above 15% like it is = somehow not getting enough priority and not sure if this is due to a = missing parameter or the fact that is running from the flash drive. I have the following additions : [radu@hp ~]$ cat /boot/loader.conf=20 # We use Samba built with AIO support; we need this module! aio_load=3D"yes" geom_journal_load=3D"YES" kern.maxfiles=3D"25000" # Set TXG write limit to a lower threshold. This helps "level out" # the throughput rate (see "zpool iostat"). A value of 256MB works well # for systems with 4 GB of RAM, while 1 GB works well for us w/ 8 GB on=20= # disks which have 64 MB cache. <<BR>> # NOTE: in <v28, this tunable is called = 'vfs.zfs.txg.write_limit_override'. vfs.zfs.write_limit_override=3D792723456 $ cat /etc/sysctl.conf=20 # $FreeBSD: release/10.0.0/etc/sysctl.conf 112200 2003-03-13 18:43:50Z = mux $ # # This file is read when going to multi-user and its contents piped = thru # ``sysctl'' to adjust kernel values. ``man 5 sysctl.conf'' for = details. # # Uncomment this to prevent users from seeing information about = processes that # are being run under another UID. #security.bsd.see_other_uids=3D0 vfs.zfs.prefetch_disable=3D1 # Increase send/receive buffer maximums from 256KB to 16MB. # FreeBSD 7.x and later will auto-tune the size, but only up to the max. net.inet.tcp.sendbuf_max=3D16777216 net.inet.tcp.recvbuf_max=3D16777216 # Double send/receive TCP datagram memory allocation. This defines the # amount of memory taken up by default *per socket*. net.inet.tcp.sendspace=3D65536 net.inet.tcp.recvspace=3D131072 In /usr/local/etc/smb.conf .... socket options =3D TCP_NODELAY SO_SNDBUF=3D131072 SO_RCVBUF=3D131072 use sendfile =3D no min receivefile size =3D 16384 aio read size =3D 16384 aio write size =3D 16384 aio write behind =3D yes Please help me tune the samba so I can match most of the NFS performance = so I can use it for watching full hd movies. Thank you very much, Radu
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