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[simg2img_simple] Abandon splice if it's too slow.

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This commit is contained in:
Pierre-Hugues Husson 2021-03-20 21:55:07 +01:00
parent abec25d226
commit 926613d464
1 changed files with 8 additions and 1 deletions
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9
cmds/simg2img_simple.cpp
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@ -41,10 +41,17 @@ typedef struct chunk_header {
* For a CRC32 chunk, it's 4 bytes of CRC32 * For a CRC32 chunk, it's 4 bytes of CRC32
*/ */
static int disable_splice = 0;
void nsendfile(int out_fd, int in_fd, size_t count) { void nsendfile(int out_fd, int in_fd, size_t count) {
char buf[1024*1024]; char buf[1024*1024];
while(count) { while(count) {
ssize_t res = splice(in_fd, NULL, out_fd, NULL, count, 0); ssize_t res = -1;
if(!disable_splice) {
res = splice(in_fd, NULL, out_fd, NULL, count, 0);
}
if(count > 16*1024 && res < 1024)
disable_splice = 1;
if(res==-1) { if(res==-1) {
ssize_t sizeToRead = sizeof(buf); ssize_t sizeToRead = sizeof(buf);
if(count < sizeToRead) sizeToRead = count; if(count < sizeToRead) sizeToRead = count;