Date: Thu, 10 Nov 2005 11:03:03 -0800 (PST) From: "Bradley W. Dutton" <brad-fbsd-perf@duttonbros.com> To: freebsd-performance@freebsd.org Subject: Re: Poor Samba throughput on 6.0 Message-ID: <54050.67.169.82.217.1131649383.squirrel@uno.mnl.com> In-Reply-To: <20051110090429.J33260@fledge.watson.org> References: <70e8236f0511050457s5ce6d8batf805fbc9edd91360@mail.gmail.com> <20051109060931.GD5188@obiwan.tataz.chchile.org> <70e8236f0511090517g29b3f887x1b97ef5dec04548@mail.gmail.com> <70e8236f0511090627p24c90400ke39bdb0da222a323@mail.gmail.com> <4372184C.10809@mebius.lv> <43727712.4020500@rogers.com> <20051110090429.J33260@fledge.watson.org>
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I recently upgraded to gigabit and was expecting faster Samba performance as well. I don't recall the exact numbers but net.inet.tcp.delayed_ack=0 did help quite a bit on my box. I too tried mtu (intel cards and SMC jumbo switch) and polling but the transfer rates would max out around 10megs/sec with Samba. Disk transfer rate shouldn't be a problem, the disk easily does 20+meg/sec writes. ttcp transfer rates are 30+ megs/sec. One thing I did notice with ttcp is that using the -D option (TCP_NODELAY?) helped a lot. I'm using a freebsd/samba 6.0 server and windows xp clients. I'll test the other 2 sysctls over the next few days to see if they help. Thanks, Brad > On Wed, 9 Nov 2005, Mike Jakubik wrote: > >> I have done many tests to try to determine the poor performance on my >> systems (FreeBSD-current connected directly to Windows XP via identical >> Intel Pro 1000 cards) and my only conclusion is that Samba on FreeBSD >> when talking to a Windows box is simply fubared. Im willing to bet thats >> not the case on Linux. I can get great speeds (~30MB/s) using ftp >> between the machines, but when i use Samba, i get a maximum of 11MB/s. I >> have tried playing with mtu size, samba options, polling, but there does >> not seem to be any visible bottlenecks, its just simply slow. It would >> be great if someone could get to the bottom of this, its quite >> frustrating. > > There are a number of TCP related configuration frobs on FreeBSD. It > would be quite interesting to know how modifying each of the following > settings affects Samba performance: > > net.inet.tcp.delayed_ack > net.inet.tcp.sack.enable > net.inet.tcp.inflight.enable > > There has been recent evidence that the inflight bandwidth calculation is > having problems generating stable performance at high bandwidth and low > latency, so I might try that one first. > > Robert N M Watson
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