Re: Test report for kernel direct mapping performance

2021-01-27 Thread Xing Zhengjun
On 1/26/2021 11:00 PM, Michal Hocko wrote: On Fri 15-01-21 15:23:07, Xing Zhengjun wrote: Hi, There is currently a bit of a debate about the kernel direct map. Does using 2M/1G pages aggressively for the kernel direct map help performance? Or, is it an old optimization which is not as

Re: Test report for kernel direct mapping performance

2021-01-26 Thread Michal Hocko
On Fri 15-01-21 15:23:07, Xing Zhengjun wrote: > Hi, > > There is currently a bit of a debate about the kernel direct map. Does using > 2M/1G pages aggressively for the kernel direct map help performance? Or, is > it an old optimization which is not as helpful on modern CPUs as it was in > the

Test report for kernel direct mapping performance

2021-01-14 Thread Xing Zhengjun
Hi, There is currently a bit of a debate about the kernel direct map. Does using 2M/1G pages aggressively for the kernel direct map help performance? Or, is it an old optimization which is not as helpful on modern CPUs as it was in the old days? What is the penalty of a kernel feature that