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blk: shrink max log size

--- a/fs.c

+++ b/fs.c

@@ -2314,7 +2314,7 @@

 		 * don't want to spend a ton of time compressing, though,

 		 * so we only do the compression when our log gets big.

 		 *

-		 * 1/4 of our reserved emergency space seems like a good

+		 * 10% of our reserved emergency space seems like a good

 		 * heuristic for big, but it was picked arbitrarily.

 		 */

 		qlock(&fs->synclk);

@@ -2321,7 +2321,7 @@

 		for(i = 0; i < fs->narena; i++){

 			epochstart(id);

 			qlock(&fs->arenas[i]);

-			c = fs->arenas[i].nlog > fs->arenas[i].reserve/(4*Blksz);

+			c = fs->arenas[i].nlog > fs->arenas[i].reserve/(10*Blksz);

 			if(c){

 				if(compresslog(&fs->arenas[i]) == -1)

 					fprint(2, "compress log: %r");