diff --git a/buf/buf0flu.c b/buf/buf0flu.c
index 304472bb319..f866fd105e2 100644
--- a/buf/buf0flu.c
+++ b/buf/buf0flu.c
@@ -480,8 +480,8 @@ buf_flush_init_for_writing(
                   buf_calc_page_old_checksum(page) : BUF_NO_CHECKSUM_MAGIC);
 #if 1 /* testing */
 	if (space /* skip the system tablespace */
-	    && (page_no & (UNIV_PAGE_SIZE - 1)) /* skip extent descriptors */
-	    && page_is_comp(page) /* skip row_format=redundant pages */) {
+	    && page_no != FSP_FIRST_INODE_PAGE_NO
+	    && page_no % XDES_DESCRIBED_PER_PAGE > FSP_IBUF_BITMAP_OFFSET) {
 		if (memcmp(page + PAGE_NEW_INFIMUM, "infimum", 8)) {
 			fprintf(stderr, "page %lu:%lu: cannot compress\n",
 				(ulong) space, (ulong) page_no);
@@ -495,8 +495,11 @@ buf_flush_init_for_writing(
 
 			ut_a(page_zip_compress(page_zip, page));
 
-			fprintf(stderr, "page %lu:%lu: zip size==%lu+%lu\n",
+			fprintf(stderr,
+				"page %lu:%lu (%lu): zip size==%lu+%lu\n",
 				(ulong) space, (ulong) page_no,
+				(ulong) mach_read_from_2(page
+						+ (PAGE_HEADER + PAGE_LEVEL)),
 				(ulong) page_zip->m_start,
 				(ulong) 2
 				* page_dir_get_n_heap(page_zip->data));
diff --git a/include/page0zip.h b/include/page0zip.h
index 534ecec44a4..1088421186d 100644
--- a/include/page0zip.h
+++ b/include/page0zip.h
@@ -62,7 +62,9 @@ page_zip_simple_validate(
 						/* out: TRUE if ok */
 	const page_zip_des_t*	page_zip);	/* in: compressed page
 						descriptor */
+#endif /* UNIV_DEBUG */
 
+#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
 /**************************************************************************
 Check that the compressed and decompressed pages match. */
 
@@ -71,7 +73,7 @@ page_zip_validate(
 /*==============*/
 	const page_zip_des_t*	page_zip,/* in: compressed page */
 	const page_t*		page);	/* in: uncompressed page */
-#endif /* UNIV_DEBUG */
+#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
 
 /*****************************************************************
 Gets the size of the compressed page trailer (the dense page directory). */
diff --git a/include/univ.i b/include/univ.i
index 15650f22ed8..087c1cfad0b 100644
--- a/include/univ.i
+++ b/include/univ.i
@@ -93,6 +93,7 @@ some consistency checks to code. They use a little CPU time. */
 #define UNIV_SYNC_PERF_STAT
 #define UNIV_SEARCH_PERF_STAT
 #define UNIV_SRV_PRINT_LATCH_WAITS;
+#define UNIV_ZIP_DEBUG
 */
 #define UNIV_LIGHT_MEM_DEBUG
 
diff --git a/page/page0zip.c b/page/page0zip.c
index fdfd9d480b3..8e160bd09b6 100644
--- a/page/page0zip.c
+++ b/page/page0zip.c
@@ -259,7 +259,9 @@ zlib_error:
 	memset(page_zip->data + PAGE_DATA + c_stream.total_out, 0,
 		c_stream.avail_out + 1);
 	mem_heap_free(heap);
-	ut_ad(page_zip_validate(page_zip, page));
+#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
+	ut_a(page_zip_validate(page_zip, page));
+#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
 	return(TRUE);
 }
 
@@ -740,7 +742,7 @@ zlib_error:
 	return(TRUE);
 }
 
-#ifdef UNIV_DEBUG
+#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
 /**************************************************************************
 Check that the compressed and decompressed pages match. */
 
@@ -763,7 +765,7 @@ page_zip_validate(
 	buf_frame_free(temp_page);
 	return(valid);
 }
-#endif /* UNIV_DEBUG */
+#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
 
 /**************************************************************************
 Write data to the compressed portion of a page.  The data must already
@@ -806,8 +808,10 @@ page_zip_write(
 	page_zip->m_end += length;
 	ut_ad(!page_zip->data[page_zip->m_end]);
 	ut_ad(page_zip->m_end + trailer_len < page_zip->size);
-	ut_ad(page_zip_validate(page_zip,
+#if defined UNIV_DEBUG || defined UNIV_ZIP_DEBUG
+	ut_a(page_zip_validate(page_zip,
 				ut_align_down((byte*) str, UNIV_PAGE_SIZE)));
+#endif /* UNIV_DEBUG || UNIV_ZIP_DEBUG */
 }
 
 #ifdef UNIV_DEBUG