From: zooko <zooko@zooko.com>
Date: Wed, 14 Nov 2007 16:44:26 +0000 (+0530)
Subject: zfec: set STRIDE to 8192 after extensive experimentation on my PowerPC G4 867 MHz... 
X-Git-Url: https://git.rkrishnan.org/vdrive/%22news.html/simplejson?a=commitdiff_plain;h=908090a43dde3d9d8635f79712aafc9b8cdecefa;p=tahoe-lafs%2Fzfec.git

zfec: set STRIDE to 8192 after extensive experimentation on my PowerPC G4 867 MHz (256 KB L2 cache)

darcs-hash:c361c87dc18b6938cd0756a084c022484a4220f8
---

diff --git a/zfec/zfec/fec.c b/zfec/zfec/fec.c
index 84f4645..e220546 100644
--- a/zfec/zfec/fec.c
+++ b/zfec/zfec/fec.c
@@ -473,7 +473,7 @@ fec_new(unsigned k, unsigned n) {
 
 /* To make sure that we stay within cache in the inner loops of fec_encode()
    and fec_decode(). */
-#define STRIDE 1024
+#define STRIDE 8192
 
 void
 fec_encode(const fec_t* code, const gf*restrict const*restrict const src, gf*restrict const*restrict const fecs, const unsigned*restrict const block_nums, size_t num_block_nums, size_t sz) {