From: Wu Fengguang Bypass nfsd raparms cache -- the new logic do not rely on it. -------------------------------- For the case of NFS service, the new read-ahead logic + can handle disordered nfsd requests + can handle concurrent sequential requests on large files with the help of look-ahead - will have much ado about the concurrent ones on small files -------------------------------- Notes about the concurrent nfsd requests issue: nfsd read requests can be out of order, concurrent and with no ra-state info. They are handled by the context based read-ahead method, which does the job in the following steps: 1. scan in page cache 2. make read-ahead decisions 3. alloc new pages 4. insert new pages to page cache A single read-ahead chunk in the client side will be dissembled and serviced by many concurrent nfsd in the server side. It is highly possible for two or more of these parallel nfsd instances to be in step 1/2/3 at the same time. Without knowing others working on the same file region, they will issue overlapped read-ahead requests, which lead to many conflicts at step 4. There's no much luck to eliminate the concurrent problem in general and efficient ways. But experiments show that mount with tcp,rsize=32768 can cut down the overhead a lot. -------------------------------- Here are the benchmark outputs. The test cases cover - small/big files - small/big rsize mount option - serialized/parallel nfsd processing `serialized' means running the following command to enforce serialized nfsd requests processing: # for pid in `pidof nfsd`; do taskset -p 1 $pid; done 8 nfsd; local mount with tcp,rsize=8192 ======================================= SERIALIZED, SMALL FILES readahead_ratio = 0, ra_max = 128kb (old logic, the ra_max is not quite relevant) 96.51s real 11.32s system 3.27s user 160334+2829 cs diff -r $NFSDIR $NFSDIR2 readahead_ratio = 70, ra_max = 1024kb (new read-ahead logic) 94.88s real 11.53s system 3.20s user 152415+3777 cs diff -r $NFSDIR $NFSDIR2 SERIALIZED, BIG FILES readahead_ratio = 0, ra_max = 128kb 56.52s real 3.38s system 1.23s user 47930+5256 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 70, ra_max = 1024kb 32.54s real 5.71s system 1.38s user 23851+17007 cs diff $NFSFILE $NFSFILE2 PARALLEL, SMALL FILES readahead_ratio = 0, ra_max = 128kb 99.87s real 11.41s system 3.15s user 173945+9163 cs diff -r $NFSDIR $NFSDIR2 readahead_ratio = 70, ra_max = 1024kb 100.14s real 12.06s system 3.16s user 170865+13406 cs diff -r $NFSDIR $NFSDIR2 PARALLEL, BIG FILES readahead_ratio = 0, ra_max = 128kb 63.35s real 5.68s system 1.57s user 82594+48747 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 70, ra_max = 1024kb 33.87s real 10.17s system 1.55s user 72291+100079 cs diff $NFSFILE $NFSFILE2 8 nfsd; local mount with tcp,rsize=32768 ======================================== Note that the normal data are now much better, and come close to that of the serialized ones. PARALLEL/NORMAL readahead_ratio = 8, ra_max = 1024kb (old logic) 48.36s real 2.22s system 1.51s user 7209+4110 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 70, ra_max = 1024kb (new logic) 30.04s real 2.46s system 1.33s user 5420+2492 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 8, ra_max = 1024kb 92.99s real 10.32s system 3.23s user 145004+1826 cs diff -r $NFSDIR $NFSDIR2 > /dev/null readahead_ratio = 70, ra_max = 1024kb 90.96s real 10.68s system 3.22s user 144414+2520 cs diff -r $NFSDIR $NFSDIR2 > /dev/null SERIALIZED readahead_ratio = 8, ra_max = 1024kb 47.58s real 2.10s system 1.27s user 7933+1357 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 70, ra_max = 1024kb 29.46s real 2.41s system 1.38s user 5590+2613 cs diff $NFSFILE $NFSFILE2 readahead_ratio = 8, ra_max = 1024kb 93.02s real 10.67s system 3.25s user 144850+2286 cs diff -r $NFSDIR $NFSDIR2 > /dev/null readahead_ratio = 70, ra_max = 1024kb 91.15s real 11.04s system 3.31s user 144432+2814 cs diff -r $NFSDIR $NFSDIR2 > /dev/null Signed-off-by: Wu Fengguang Signed-off-by: Andrew Morton --- fs/nfsd/vfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff -puN fs/nfsd/vfs.c~readahead-nfsd-case fs/nfsd/vfs.c --- a/fs/nfsd/vfs.c~readahead-nfsd-case +++ a/fs/nfsd/vfs.c @@ -831,7 +831,10 @@ nfsd_vfs_read(struct svc_rqst *rqstp, st #endif /* Get readahead parameters */ - ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); + if (prefer_adaptive_readahead()) + ra = NULL; + else + ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); if (ra && ra->p_set) file->f_ra = ra->p_ra; _