From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Simmons Date: Mon, 30 Sep 2019 14:55:12 -0400 Subject: [lustre-devel] [PATCH 053/151] lustre: llite: increase whole-file readahead to RPC size In-Reply-To: <1569869810-23848-1-git-send-email-jsimmons@infradead.org> References: <1569869810-23848-1-git-send-email-jsimmons@infradead.org> Message-ID: <1569869810-23848-54-git-send-email-jsimmons@infradead.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org From: Andreas Dilger Increase the default whole-file readahead limit to match the current RPC size. That ensures that files smaller than the RPC size will be read in a single round-trip instead of sending multiple smaller RPCs. WC-bug-id: https://jira.whamcloud.com/browse/LU-7990 Lustre-commit: 627d0133d9d7 ("LU-7990 llite: increase whole-file readahead to RPC size") Signed-off-by: Andreas Dilger Reviewed-on: https://review.whamcloud.com/26955 Reviewed-by: Patrick Farrell Reviewed-by: Dmitry Eremin Reviewed-by: Oleg Drokin Signed-off-by: James Simmons --- fs/lustre/llite/llite_lib.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/lustre/llite/llite_lib.c b/fs/lustre/llite/llite_lib.c index beacaeb..07d1568 100644 --- a/fs/lustre/llite/llite_lib.c +++ b/fs/lustre/llite/llite_lib.c @@ -95,8 +95,7 @@ static struct ll_sb_info *ll_init_sbi(void) sbi->ll_ra_info.ra_max_pages_per_file = min(pages / 32, SBI_DEFAULT_READAHEAD_MAX); sbi->ll_ra_info.ra_max_pages = sbi->ll_ra_info.ra_max_pages_per_file; - sbi->ll_ra_info.ra_max_read_ahead_whole_pages = - SBI_DEFAULT_READAHEAD_WHOLE_MAX; + sbi->ll_ra_info.ra_max_read_ahead_whole_pages = -1; ll_generate_random_uuid(uuid); sprintf(sbi->ll_sb_uuid.uuid, "%pU", uuid); @@ -269,6 +268,12 @@ static int client_common_fill_super(struct super_block *sb, char *md, char *dt) sbi->ll_md_exp->exp_connect_data = *data; + /* Don't change value if it was specified in the config log */ + if (sbi->ll_ra_info.ra_max_read_ahead_whole_pages == -1) + sbi->ll_ra_info.ra_max_read_ahead_whole_pages = + max_t(unsigned long, SBI_DEFAULT_READAHEAD_WHOLE_MAX, + (data->ocd_brw_size >> PAGE_SHIFT)); + err = obd_fid_init(sbi->ll_md_exp->exp_obd, sbi->ll_md_exp, LUSTRE_SEQ_METADATA); if (err) { -- 1.8.3.1