Date: Mon, 12 Mar 2001 11:11:08 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Mark Murray <mark@grondar.za> Cc: Bruce Evans <bde@zeta.org.au>, Maxim Sobolev <sobomax@FreeBSD.ORG>, current@FreeBSD.ORG Subject: Re: Ethernet entropy harvesting seriously pessimizes performance Message-ID: <200103121911.f2CJB8o71169@earth.backplane.com> References: <Pine.BSF.4.21.0103130357490.719-100000@besplex.bde.org> <200103121854.f2CIsff91075@gratis.grondar.za>
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Please try this patch. This should solve all the random harvesting
performance issues no matter how efficient or inefficient the hash
function (untested as I do not have a -current box at the moment).
-Matt
Index: yarrow.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/random/yarrow.c,v
retrieving revision 1.31
diff -u -r1.31 yarrow.c
--- yarrow.c 2001/02/11 16:21:35 1.31
+++ yarrow.c 2001/03/12 19:09:15
@@ -104,11 +104,8 @@
for (;;) {
- if (harvestring.tail == harvestring.head)
- tsleep(&harvestring, PUSER, "rndslp", hz/10);
-
- else {
-
+ tsleep(&harvestring, PUSER, "rndslp", hz/10);
+ if (harvestring.tail != harvestring.head) {
/* Suck the harvested entropy out of the queue and hash
* it into the appropriate pool.
*/
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