Date: Sun, 04 Jun 2006 19:53:15 +0200 From: Pavel Duda <element@email.cz> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD and newer HDD problems ? Message-ID: <e5v6me$a34$1@sea.gmane.org> In-Reply-To: <44831BAD.3080904@webanoide.org> References: <e5v0v9$oqn$1@sea.gmane.org> <44831BAD.3080904@webanoide.org>
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Mikhail Goriachev wrote: > Pavel Duda wrote: > >>Hello, >>I've recently bought new big HDD (WDC RE, 320GB) and it looks like >>FreeBSD has some troubles with it when trying to transfer files over >>network. >> >>If I try to perform some "synthetic" test like 'dd if=/dev/zero >>of=/wdc320/testfile' then I get some decent speeds about 40MB/s. When I >>try to copy some big files from my older disk (IBM 40GB) I still have >>write about 25-27MB/s. >> >>Problem comes when I try to copy something to disk over network (tried >>samba, ftp) disk write speed is very low - about 5-6MB/s at max. >>When testing this issue I've start 'systat -vmstat 1' and noticed that >>my new disk is very busy (60-100%) and speed (MB/s) jumps up and down. >>If I write files with 'dd' or transfer them from disk 2 disk then write >>speed and disk load is almost constant (about 60%). When transfering >>files over network to old HDD then disk load is low (40-50%) and speed >>is constant (8-9MB/s). >> >>To be sure that disk it is not some kind of disk problem I've installed >>Debian 3.1r2 with same version of samba and I get 9-11MB/s transfer >>speeds (in both directions) !! >> >>Also it doesn't matter if I use transfer data over gigabit card or >>100mbit card. Results are similar. FreeBSD is in avarage very very slow >>(3MB) while Debian works fine (10MB). Because my server is primarily >>used for transfer files (Samba + PDC) it is crucial for me to have >>highest transfer speeds possible and I'd like to stick with FreeBSD :-/. >> >>Does someone has any idea what could be wrong or how could I determine >>what causes this problem ? >> > > > Hi, > > This effect is normal since you're transferring files over relatively > slow network. The speed through 100Mb/s Ethernet will be around 5 or > 6MB/s and probably you can't go any faster due to your hardware > limitations (switch, cables, processor, controllers and especially their > drivers). > > Currently there are a few active threads related to similar issues > (controllers and their drivers). You might be interested in following them: > > http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123577.html > http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123588.html > http://lists.freebsd.org/pipermail/freebsd-questions/2006-June/123673.html > > > Cheers, > Mikhail. > Hmmm so how you explain that with Debian system on SAME machine I'm ABLE to get transfer speeds about 10MB/s ?? Or do you mean I can't go faster with FreeBSD and only solution is switch to Linux ??
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