similar to: [PATCH] Btrfs: don't call readahead hook until we have read the entire eb

From: Wade Cline <clinew@linux.vnet.ibm.com> This patch is only an RFC. My internship is ending and I was hoping to get some feedback and incorporate any suggestions people may have before my internship ends along with life as we know it (this Friday). The filesystem should mount/umount properly but tends towards the explosive side when writes start happening. My current focus is on

This series introduces a generic readahead interface for btrfs trees. The intention is to use it to speed up scrub in a first run, but balance is another hot candidate. In general, every tree walk could be accompanied by a readahead. Deletion of large files comes to mind, where the fetching of the csums takes most of the time. Also the initial build-ups of free-space-caches and

This series introduces a generic readahead interface for btrfs trees. The intention is to use it to speed up scrub in a first run, but balance is another hot candidate. In general, every tree walk could be accompanied by a readahead. Deletion of large files comes to mind, where the fetching of the csums takes most of the time. Also the initial build-ups of free-space-caches and

Dear Developers, I've been struggling through writing R extension in C. I've been using an external pointer to store my data (please see sample below). I encountered a very weird erroneous behaviour: when I tried to use my external pointer to a structure holding several types of data, including SEXPs, I discovered that SEXPs change their types between returning from initialization

This patch introduce extent buffer cache for every i-node. By this way, we can save the search time and reduce the lock contention of the root because we needn''t search the item from the root of b+ tree. Implementation: - add two pointers of extent buffer into btrfs_inode struct, one for nodes/leaves of fs/file tree, the other for nodes/leaves of the log tree. - add a variant to tell

I would like to compute the MC test (rfm.test) available in the package MarkedPointProcess (for the data BITOEK for example) in order to test the dependence between the marks and their locations. Why the syntax of rfm.test is false here? I have the message : ****************************** ML WARNING! Forbidden values! -- if there are too many warnings try narrower lower and upper bounds for the

Hey all- I've had no problems configuring my linux box to server SMB shares to win9X boxes. everytime I try to have a samba server speak to an NT box, the NT box can see the samba server in the network neighborhood, view the share names, if I try to open a share, it says \\Suse\Homes is not accessible The network name cannot be found. Why is this? The networks I've always tried this

This program connects to a device that lets me view a live stream or recorded videos of cameras that are connected to the device. There are two ways of viewing which are with or without the use of DirectDraw. Without I can see the stream without a problem but the pieces of text on top of the images are constantly flickering and with DirectDraw I am unable to see any images and the repeating

Is there any good IAX2 or SIP free web client? Im looking for something open source or free preferably IAX2 for integrating into a web site... Any leads?

https://bugzilla.netfilter.org/show_bug.cgi?id=1149 Bug ID: 1149 Summary: xtables-eb.c:533: bad test ? Product: netfilter/iptables Version: unspecified Hardware: x86_64 OS: All Status: NEW Severity: enhancement Priority: P5 Component: ip_tables (kernel) Assignee:

Source: xen Version: 4.1.2-3 Severity: serious Tags: wheezy sid User: debian-qa at lists.debian.org Usertags: qa-ftbfs-20120321 qa-ftbfs Justification: FTBFS on amd64 Hi, During a rebuild of all packages in sid, your package failed to build on amd64. Relevant part: > make[7]: Entering directory `/?PKGBUILDDIR?/debian/build/build-utils_amd64/tools/firmware' > /usr/bin/make -C etherboot

I have empirical Bayes estimates for slopes and intercepts for a number of subjects and I would like to plot the slopes and intercepts with confidence ellipses. These ellipses would be based on the confidence intervals for the slope and intercepts (forming the major and minor axis of each ellipse), and the correlation in the slope and intercepts. The ellipse function in the car library

Reduce ioprio class of scrub readahead threads to idle priority. This setting is fixed. This priority has shown the best performance during all measurements. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/reada.c | 5 +++++ 2 files changed, 8 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index ec42a24..e6f772d 100644

The readahead filter is a self-configuring filter that makes sequential reads faster when the plugin is slow (and all of the plugins we use here are always slow). I observed the behaviour of the readahead filter with our qcow2 overlay when converting a guest from a vCenter source. Even when doing random reads, qemu issues 64K reads which happen to also be the minimum request size of the

On Sat, Sep 21, 2019 at 03:54:11PM +0100, Richard W.M. Jones wrote: >On Fri, Sep 20, 2019 at 09:33:06AM -0500, Eric Blake wrote: >> Checking for file existence for filters is somewhat less fragile than >> for plugins, because all filters are built in-tree (we've specifically >> documented that we don't provide ABI guarantees for filters, so the only >> sane way

This filter deliberately tries to coalesce reads into larger requests. Unfortunately VMware has low limits on the size of requests it can serve to a VDDK client and the larger requests would break with errors like this: nbdkit: vddk[3]: error: [NFC ERROR] NfcFssrvrProcessErrorMsg: received NFC error 5 from server: Failed to allocate the requested 33554456 bytes We already increase the maximum

This appears to be the cause of timeouts during the conversion step where VMware VCenter server's Tomcat HTTPS server stops responding to requests (or rather, responds only with 503 errors). The server later recovers and in fact because of the retry filter the conversion usually succeeds, but I found that we can avoid the problem by disabling readahead. --- v2v/nbdkit_sources.ml | 8 ++++----

On Mon, Nov 09, 2020 at 07:26:13PM -0500, Robert Buck wrote: > Hi Jeremy, thank you for your very helpful response. We're looking at a few > more options. Would you have the time to provide some guidance on these, > how helpful they may be? The man pages you're pointing to here are obsolete. All accurate information is now in the wiki. > - *aio ** -> >

I'm still testing this fix, so let's hold off the review for the moment. Also it may be better to specifically identify problematic servers rather than disabling this for every curl source. eg. I suspect that the problem is the Java server used by VCenter, so we might think about only disabling readahead for that single case. Rich.

This adds a binding for 'blockdev --setra', allowing you to adjust the readahead parameter for filesystems and devices. --- daemon/blockdev.c | 30 ++++++++++++++++++++---------- generator/actions.ml | 14 ++++++++++++++ 2 files changed, 34 insertions(+), 10 deletions(-) diff --git a/daemon/blockdev.c b/daemon/blockdev.c index 8a7b1a8..6e8821d 100644 --- a/daemon/blockdev.c +++