Date: Wed, 3 Jul 2013 19:06:47 -0400 From: Outback Dingo <outbackdingo@gmail.com> To: Lawrence Stewart <lstewart@freebsd.org> Cc: net@freebsd.org Subject: Re: Terrible ix performance Message-ID: <CAKYr3zyFF%2BA-OHsEL7t6rdv6Jc4c2ByvvRhV-Fv%2BPXt9Y-sXwg@mail.gmail.com> In-Reply-To: <51D42976.9020206@freebsd.org> References: <CAKYr3zyV74DPLsJRuDoRiYsYdAXs=EoqJ6%2B_k4hJiSnwq5zhUQ@mail.gmail.com> <51D3E5BC.1000604@freebsd.org> <CAKYr3zyWzQsFOrQ-MrGTdTzJzhP1kXNac%2BHu8NXfC_J6YJcOsg@mail.gmail.com> <51D42976.9020206@freebsd.org>
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On Wed, Jul 3, 2013 at 9:39 AM, Lawrence Stewart <lstewart@freebsd.org>wrote: > On 07/03/13 22:58, Outback Dingo wrote: > > On Wed, Jul 3, 2013 at 4:50 AM, Lawrence Stewart <lstewart@freebsd.org > > <mailto:lstewart@freebsd.org>> wrote: > > > > On 07/03/13 14:28, Outback Dingo wrote: > > > Ive got a high end storage server here, iperf shows decent network > io > > > > > > iperf -i 10 -t 20 -c 10.0.96.1 -w 2.5M -l 2.5M > > > ------------------------------------------------------------ > > > Client connecting to 10.0.96.1, TCP port 5001 > > > TCP window size: 2.50 MByte (WARNING: requested 2.50 MByte) > > > ------------------------------------------------------------ > > > [ 3] local 10.0.96.2 port 34753 connected with 10.0.96.1 port 5001 > > > [ ID] Interval Transfer Bandwidth > > > [ 3] 0.0-10.0 sec 9.78 GBytes 8.40 Gbits/sec > > > [ 3] 10.0-20.0 sec 8.95 GBytes 7.69 Gbits/sec > > > [ 3] 0.0-20.0 sec 18.7 GBytes 8.05 Gbits/sec > > > > Given that iperf exercises the ixgbe driver (ix), network path and > TCP, > > I would suggest that your subject is rather misleading ;) > > > > > the card has a 3 meter twinax cable from cisco connected to it, > going > > > through a fujitsu switch. We have tweaked various networking, and > > kernel > > > sysctls, however from a sftp and nfs session i cant get better > > then 100MBs > > > from a zpool with 8 mirrored vdevs. We also have an identical box > > that will > > > get 1.4Gbs with a 1 meter cisco twinax cables that writes 2.4Gbs > > compared > > > to reads only 1.4Gbs... > > > > I take it the RTT between both hosts is very low i.e. sub 1ms? > > An answer to the above question would be useful. > > > > does anyone have an idea of what the bottle neck could be?? This > is a > > > shared storage array with dual LSI controllers connected to 32 > > drives via > > > an enclosure, local dd and other tests show the zpool performs > > quite well. > > > however as soon as we introduce any type of protocol, sftp, samba, > nfs > > > performance plummets. Im quite puzzled and have run out of ideas. > > so now > > > curiousity has me........ its loading the ix driver and working > > but not up > > > to speed, > > > > ssh (and sftp by extension) aren't often tuned for high speed > operation. > > Are you running with the HPN patch applied or a new enough FreeBSD > that > > has the patch included? Samba and NFS are both likely to need tuning > for > > multi-Gbps operation. > > > > > > Running 9-STABLE as of 3 days ago, what are you referring to s i can > > validate i dont need to apply it > > Ok so your SSH should have the HPN patch. > > > as for tuning for NFS/SAMBA sambas configured with AIO, and sendfile, > > and there so much information > > on tuninig these things that its a bit hard to decipher whats right and > > not right > > Before looking at tuning, I'd suggest testing with a protocol that > involves the disk but isn't as heavy weight as SSH/NFS/CIFS. FTP is the > obvious choice. Set up an inetd-based FTP instance, serve a file large > enough that it will take ~60s to transfer to the client and report back > what data rates you get from 5 back-to-back transfer trials. > > on the 1GB interface i get 100MB/s, on the 10GB interface i get 250MB/s via NFS on the 1GB Interface 1 get 112MB/s, on the 10GB interface i get ftp> put TEST3 53829697536 bytes sent in 01:56 (439.28 MiB/s) ftp> get TEST3 53829697536 bytes received in 01:21 (632.18 MiB/s) ftp> get TEST3 53829697536 bytes received in 01:37 (525.37 MiB/s) ftp> put TEST3 43474223104 bytes sent in 01:50 (376.35 MiB/s) ftp> put TEST3 local: TEST3 remote: TEST3 229 Entering Extended Passive Mode (|||10613|) 226 Transfer complete 43474223104 bytes sent in 01:41 (410.09 MiB/s) ftp> so still about 50% performance on 10GB Cheers, > Lawrence >
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