On 2014/2/28 17:19, Dr. David Alan Gilbert wrote: > * Gonglei (Arei) (arei.gong...@huawei.com) wrote: > > Hi, > >> a. Optimization the xbzrle remarkable decrease the cache misses. >> The efficiency of compress increases more than fifty times. >> Before the patch set, the cache almost totally miss when the >> number of cache item less than the dirty page number. Now the >> hot pages in the cache will not be replaced by other pages. > > Nice, what do you use as your performance test case for xbzrle?
The VM we used with 25G memory and 1Gbit nic. We run a test procedure in the vm, which as this: #include <stdio.h> #include <stdlib.h> #define PAGE_SIZE 4096 void main(void) { char *p,*p1; long i,j,z; p = (char*)calloc(8*1024,1024*1024); if( p == NULL ){ printf("fail to calloc \n"); exit(1); } for(;;){ p1 = p; for( i = 0 ; i < 8*1024 ; i++ ){ for( j = 0 ; j < 1024*1024 ; j+=PAGE_SIZE ){ *p1 = 0x55; p1+=PAGE_SIZE; } } } } finally, the results of without enable xbzrle: 115MB/sec using xbzrle without optimization (the size of cache 2G): 116MB/sec using xbzrle with our optimization (the size of cache 2G): 150MB/sec > > Dave > -- > Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK Best regards, -Gonglei