generic-library/bionic
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Increase the size of the system-wide dns cache

Browse Source 
32 enteries perhaps was ok for per-process caching with ipv4 only
but adding ipv6 records makes it effectively 16 entries and making
it system wide makes is pretty useless.  Increasing to 640 entries.

bug:5841178
Change-Id: I879f8bf4d3c4d8c1708bb46d46a67c1f64b1861f
This commit is contained in:
Robert Greenwalt 2012-01-25 15:16:03 -08:00
parent b70659d8ea
commit 52764f5546
1 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
libc/netbsd/resolv/res_cache.c
View File

@ -138,9 +138,19 @@
*
* The system property ro.net.dns_cache_size can be used to override the default
* value with a custom value
*
*
* ******************************************
* * NOTE - this has changed.
* * 1) we've added IPv6 support so each dns query results in 2 responses
* * 2) we've made this a system-wide cache, so the cost is less (it's not
* * duplicated in each process) and the need is greater (more processes
* * making different requests).
* * Upping by 2x for IPv6
* * Upping by another 5x for the centralized nature
* *****************************************
*/
#define CONFIG_MAX_ENTRIES 64
#define CONFIG_MAX_ENTRIES 64 * 2 * 5
/* name of the system property that can be used to set the cache size */
#define DNS_CACHE_SIZE_PROP_NAME "ro.net.dns_cache_size"
@ -1218,6 +1228,16 @@ _res_cache_get_max_entries( void )
int result = -1;
char cache_size[PROP_VALUE_MAX];
const char* cache_mode = getenv("ANDROID_DNS_MODE");
if (cache_mode == NULL || strcmp(cache_mode, "local") != 0) {
// Don't use the cache in local mode. This is used by the
// proxy itself.
// TODO - change this to 0 when all dns stuff uses proxy (5918973)
XLOG("setup cache for non-cache process. size=1");
return 1;
}
if (__system_property_get(DNS_CACHE_SIZE_PROP_NAME, cache_size) > 0) {
result = atoi(cache_size);
}