> -----Original Message----- > From: Benjamin Herrenschmidt [mailto:benh@xxxxxxxxxxxxxxxxxxx] > Sent: Friday, February 17, 2012 11:18 AM > To: Liu Qiang-B32616 > Cc: jgarzik@xxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx; linuxppc- > dev@xxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing > > On Fri, 2012-02-17 at 01:54 +0000, Liu Qiang-B32616 wrote: > > The default will be set in a common interface > > fsl_sata_set_irq_coalescing when initialize the controller. This > > interface will check the range of intr count and ticks and make sure > the values are reasonably. > > Allright, but the current defaults are basically no coalescing right ? > > > It's hard to find a aggressive value to adapt all scenarios, so I use > > echo to adjust the value. I remember P5020 have some performance issue, > I will check it. > > BTW, which filesystem do you use? Ext2 is lower than ext4 because > > metadata is continuously wrote to disk. You can try ext4 or xfs. > > ext3 at the moment, I plan to switch to ext4 when I finish that fsck pass > which is taking hours... I am not aware of the 5020 performance issues, > is this something documented and/or fixable ? > My patch may not meet your requirement:( For your performance requirement, I suggest use ext4 filesystem and SSD. Thanks. > Cheers, > Ben. > > ��.n��������+%������w��{.n�����{��'^�)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
