From mboxrd@z Thu Jan 1 00:00:00 1970 From: ersatz splatt Subject: pm8001 performance degradation? Date: Mon, 11 Jul 2011 12:06:15 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Return-path: Received: from mail-wy0-f174.google.com ([74.125.82.174]:40858 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752207Ab1GKTGQ (ORCPT ); Mon, 11 Jul 2011 15:06:16 -0400 Received: by wyg8 with SMTP id 8so2795560wyg.19 for ; Mon, 11 Jul 2011 12:06:15 -0700 (PDT) Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: jack_wang@usish.com, lindar_liu@usish.com Cc: linux-scsi@vger.kernel.org Hello Jack Wang and Lindar Liu, I am running the pm8001 driver (on applicable hardware including a several core SMP server). When I run on an older kernel -- e.g. 2.6.34.7 -- I get about 73Kiops via an fio test. When I run a current kernel -- e.g. 2.6.39.2 -- on the same system and same storage I get about 15Kiops running the same fio test. Perhaps something has changes in the kernel that is not being accounted for? Are you two still maintaining this driver? Regards, David