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devpipe: use 256k pipeqsize as default, make sure its a multiple of the i/o unit

--- a/sys/src/9/port/devpipe.c

+++ b/sys/src/9/port/devpipe.c

@@ -39,12 +39,10 @@

 static void

 pipeinit(void)

 {

-	if(conf.pipeqsize == 0){

-		if(conf.nmach > 1)

-			conf.pipeqsize = 256*1024;

-		else

-			conf.pipeqsize = 32*1024;

-	}

+	if(conf.pipeqsize == 0)

+		conf.pipeqsize = 256*1024;

+	/* make pipeqsize a multiple of our i/o unit */

+	conf.pipeqsize = qiomaxatomic * ((conf.pipeqsize + qiomaxatomic-1)/qiomaxatomic);

 }

 /*