Date: Thu, 24 Jan 2008 11:51:47 +0200 From: Diomidis Spinellis <dds@aueb.gr> To: Stefan Ehmann <shoesoft@gmx.net> Cc: freebsd-current@FreeBSD.ORG Subject: Re: Low NTFS read performance Message-ID: <47985FB3.2070500@aueb.gr> In-Reply-To: <200801241045.23164.shoesoft@gmx.net> References: <4797BADB.7000802@FreeBSD.org> <200801241045.23164.shoesoft@gmx.net>
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Stefan Ehmann wrote: > On Wednesday 23 January 2008 23:08:27 Diomidis Spinellis wrote: >> Diomidis Spinellis wrote in freebsd-stable@: >>> I can't get an Ultrium-2 LTO drive to stream, and (I think) I've traced >>> the problem to the read performance of the USB2-attached NTFS disk, and >>> specifically the NTFS filesystem. I'm reading a single 190GB file, and >>> the throughput I'm getting is 5.4MB/s: > > Are you using the NTFS kernel option or the sysutils/fusefs-ntfs Port? > > In my experience the latter is much faster and probably superior in most other > aspects. I'm using the NTFS kernel option. I think the problem lies in the line bread(vp, cn, ntfs_cntob(1), NOCRED, &bp); of ntfs_vnops.c. We should be reading bigger blocks. Thanks for the suggestion, I'll try the port.
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