Date: Sun, 30 Oct 2011 11:05:19 +1100 From: Adrian Chadd <adrian@freebsd.org> To: Lev Serebryakov <lev@serebryakov.spb.ru> Cc: arch@freebsd.org Subject: Re: [PATCH] fadvise(2) system call Message-ID: <CAJ-Vmo=D-b1SJ0WjJGGJ_WPK8FvE-fptDPRCGyMVhOm=FR8RYA@mail.gmail.com> In-Reply-To: <458756137.20111030024046@serebryakov.spb.ru> References: <201110281426.00013.jhb@freebsd.org> <4EAB550E.3060603@FreeBSD.org> <458756137.20111030024046@serebryakov.spb.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
2011/10/30 Lev Serebryakov <lev@serebryakov.spb.ru>: > Hello, Doug. > You wrote 29 =D0=BE=D0=BA=D1=82=D1=8F=D0=B1=D1=80=D1=8F 2011 =D0=B3., 5:2= 1:18: > >>> You can read the description of posix_fadvise() (which this implements)= here: >> If you want a real-world consumer of posix_fadvise you can take a look >> at net-p2p/libtorrent-rasterbar15. The code is ifdef'ed out for FreeBSD >> because we don't have that yet, but it should be obvious how to >> re-enable it. There are a few clients that use that lib, qbittorrent is >> probably the most straightforward. > =C2=A0net-p2p/transmission-daemon could be used, too. It shows very poor > performance on UFS (90% in pread() call and 50% of wall time to > saturate 40Mbit/s channel from fast disk) compared to Linux, where > such interface exists. ... why? Squid/Lusca doesn't suffer that way. Adrian
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAJ-Vmo=D-b1SJ0WjJGGJ_WPK8FvE-fptDPRCGyMVhOm=FR8RYA>