From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Warr Subject: Found an interesting device Date: Thu, 12 Dec 2013 09:22:49 -0600 Message-ID: <52A9D4C9.7020801@warr.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from smtprelay0202.hostedemail.com ([216.40.44.202]:36459 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751358Ab3LLPWv (ORCPT ); Thu, 12 Dec 2013 10:22:51 -0500 Received: from filter.hostedemail.com (ff-bigip1 [10.5.19.254]) by smtprelay02.hostedemail.com (Postfix) with ESMTP id 6814C12BCF3 for ; Thu, 12 Dec 2013 15:22:50 +0000 (UTC) Received: from atlas.themelon.org (cpe-173-172-11-43.tx.res.rr.com [173.172.11.43]) (Authenticated sender: jason@warr.net) by omf01.hostedemail.com (Postfix) with ESMTPA for ; Thu, 12 Dec 2013 15:22:49 +0000 (UTC) Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: "linux-bcache@vger.kernel.org" Some of you may be interested in this PCIe card: http://www.addonics.com/products/ad4mspx2.php I just received a couple of them and have done basic functionality testing. No bcache yet but that is what they are intended for. The controller is a Marvell 88SE9230 connected via an x2 link. 03:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9230 PCIe SATA 6Gb/s Controller (rev 10) LnkCap: Port #0, Speed 5GT/s, Width x2, ASPM L0s L1, Latency L0 <512ns, L1 <64us ClockPM- Surprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 5GT/s, Width x2, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-- Kernel driver in use: ahci Kernel modules: ahci [8:0:0:0] disk ATA MKNSSDAT120GB-DX 521A /dev/sde [9:0:0:0] disk ATA MKNSSDAT120GB-DX 507A /dev/sdf So you are theoretically limited to less than 1GB/s across PCIe but for caching purposes I'm more interested in IOPS than raw bandwidth anyways. Using "dd if=/dev/zero of=/dev/sdX bs=1M oflag=direct" I am seeing ~380MB/s per device on 2 Mushkin MKNSSDAT120GB-DX concurrently. Not the greatest test but it does show that they work OK. I am getting Fedora 20 installed the way I want it and then the real testing will begin.