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Merge "Increase the size of the system-wide dns cache"

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Robert Greenwalt 2012-01-26 14:51:08 -08:00 committed by Android (Google) Code Review
commit 514126b2b5
1 changed files with 22 additions and 2 deletions
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24
libc/netbsd/resolv/res_cache.c
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@ -138,9 +138,19 @@
* *
* The system property ro.net.dns_cache_size can be used to override the default * The system property ro.net.dns_cache_size can be used to override the default
* value with a custom value * 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 */ /* 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" #define DNS_CACHE_SIZE_PROP_NAME "ro.net.dns_cache_size"
@ -1218,6 +1228,16 @@ _res_cache_get_max_entries( void )
int result = -1; int result = -1;
char cache_size[PROP_VALUE_MAX]; 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) { if (__system_property_get(DNS_CACHE_SIZE_PROP_NAME, cache_size) > 0) {
result = atoi(cache_size); result = atoi(cache_size);
} }