> -----Original Message----- > From: linuxppc-dev-bounces+tie-fei.zang=freescale.com@xxxxxxxxxxxxxxxx > [mailto:linuxppc-dev-bounces+tie-fei.zang=freescale.com@xxxxxxxxxxxxxxxx] > On Behalf Of Benjamin Herrenschmidt > Sent: Friday, February 17, 2012 11:19 AM > To: Li Yang-R58472 > Cc: Liu Qiang-B32616; jgarzik@xxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; > linux-kernel@xxxxxxxxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx > Subject: RE: [PATCH V2 RESEND] fsl-sata: I/O load balancing > > On Fri, 2012-02-17 at 03:09 +0000, Li Yang-R58472 wrote: > > >I tried a debian install on the p5020ds here and I find SATA to be > > >extremely slow, generating millions of interrupts. I think the > > defaults > > >should be a lot more aggressive at coalescing. > > > > The P5020 has a hardware problem with SATA, making it generate more > > interrupts than it should. A new revision of the silicon will fix it. > > Ok cool. With a bit of luck you guys can send me a new silicon when it's > available then :-) (The one in the board you got me seems to be in a > socket). Ben, We still do not have the a P5020 sample to fix the problem. One workaround is to use the patch ( I think you have noticed the patch): http://git.freescale.com/git/cgit.cgi/ppc/sdk/linux.git/commit/?id=92c0ce1e599e788ffc0908739db9bd5e0dbdad69 and use a SSD hard drive. It will have a usable performance. Thanks. Roy -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
