Date: Tue, 08 Feb 2011 11:11:59 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-emulation@freebsd.org Subject: Re: VirtualBox native iscsi initiator performance is bad Message-ID: <E1Pmjc7-000I2Z-Qe@kabab.cs.huji.ac.il> In-Reply-To: <AANLkTinokgSOSQ_%2B3Zzj5mMz3MYf3npzuKACFsUR7oDC@mail.gmail.com> References: <AANLkTinokgSOSQ_%2B3Zzj5mMz3MYf3npzuKACFsUR7oDC@mail.gmail.com>
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> Using the native Vbox iscsi initiator for very simple tests I'm getting > slightly less than 20 MB/s write speed and VM takes a long time to boot > because of DMA LBA errors are being reported on the iscsi/sata disk. > > If I mount the iscsi on the host, I get close to 50 MB/s and then if I map > that to a Virtualbox raw disk, and stick in a VM I get around 42 MB/s write > speed. I haven't done any tuning on iscsi target so perhaps that could > improve things, but I'm concerned about the huge drop off in performance and > reliability issues with the Vbox native version. Does anyone have insight > into this? > > virtualbox-ose-3.2.12 > istgt-20110103 > > These are both recent 8-STABLE versions of Virtualbox. have you measured the tcp/ip performance of the virtual box? last time I checked it was not that good, remeber that iscsi is TCP based. danny
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