Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-23 Thread Yadan Fan
Hi Johannes, On 2017年06月22日 18:06, Johannes Thumshirn wrote: On Thu, Jun 22, 2017 at 05:58:44PM +0800, Yadan Fan wrote: The hpsa firmware will bypass the cache for any request larger than 1MB, so we should cap the request size to avoid any performance degradation in SLE12-SP2. Upstream

Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-23 Thread Yadan Fan
Hi Johannes, On 2017年06月22日 18:06, Johannes Thumshirn wrote: On Thu, Jun 22, 2017 at 05:58:44PM +0800, Yadan Fan wrote: The hpsa firmware will bypass the cache for any request larger than 1MB, so we should cap the request size to avoid any performance degradation in SLE12-SP2. Upstream

Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-22 Thread Johannes Thumshirn
On Thu, Jun 22, 2017 at 05:58:44PM +0800, Yadan Fan wrote: > The hpsa firmware will bypass the cache for any request larger > than 1MB, so we should cap the request size to avoid any > performance degradation in SLE12-SP2. Upstream doesn't care too much about SLES. > References: bsc#1025461 and

Re: [PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-22 Thread Johannes Thumshirn
On Thu, Jun 22, 2017 at 05:58:44PM +0800, Yadan Fan wrote: > The hpsa firmware will bypass the cache for any request larger > than 1MB, so we should cap the request size to avoid any > performance degradation in SLE12-SP2. Upstream doesn't care too much about SLES. > References: bsc#1025461 and

[PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-22 Thread Yadan Fan
The hpsa firmware will bypass the cache for any request larger than 1MB, so we should cap the request size to avoid any performance degradation in SLE12-SP2. This degradation is caused from d2be537c3ba3568acd79cd178327b842e60d035e, which changed max_sectors_kb to 1280k, but the hardware is able

[PATCH 1/2] hpsa: limit transfer length to 1MB

2017-06-22 Thread Yadan Fan
The hpsa firmware will bypass the cache for any request larger than 1MB, so we should cap the request size to avoid any performance degradation in SLE12-SP2. This degradation is caused from d2be537c3ba3568acd79cd178327b842e60d035e, which changed max_sectors_kb to 1280k, but the hardware is able