search for: cork

...as I need more time to investigate why Unix sockets appeared to degrade with this patch. But as TCP sockets (over loopback to localhost) and TLS sessions (regardless of underlying Unix or TCP) both showed improvements, this looks like a worthwhile series. Eric Blake (2): server: Add support for corking server: Cork around grouped transmission send()s server/internal.h | 3 +++ server/connections.c | 27 +++++++++++++++++++++++ server/crypto.c | 19 ++++++++++++++++ server/protocol.c | 52 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 101 insertions(+) -- 2.20....

As mentioned in the previous patch, sending small packets as soon as possible leads to network packet overhead. Grouping related writes under corking appears to help everything but unencrypted Unix plain sockets. I tested with appropriate combinations from: $ nbdkit {-p 10810,-U -} \ {--tls=require --tls-verify-peer --tls-psk=./keys.psk,} memory size=64m \ --run './aio-parallel-load{-tls,} {$unixsocket,nbd://localhost:10810}' wi...

...n->send() more than once. Now that we've disabled Nagle's algorithm, this implies that we try harder to send the small header immediately, rather than batching it with the rest of the payload, which causes more overhead in the amount of actual network traffic. For interfaces that support corking (gnutls, or Linux TCP sockets), we can give a hint that the separate send() calls should be batched into a single network packet where practical. This patch just wires up support; the next one will actually use it and provide performance measurements. Signed-off-by: Eric Blake <eblake@redha...

In the recent commit 3842a080 to add SEND_MORE support, I blindly implemented the tls code as: if (SEND_MORE) { cork send } else { send uncork } because it showed improvements for my test case of aio-parallel-load from libnbd. But that test sticks to 64k I/O requests. But with further investigation, I've learned that even though gnutls corking works great for smaller NBD_CMD_READ replies, it can a...

...ly noticeable, but with TLS this really shows. > > Booting a VM via qemu-nbd on localhost (with tls) takes more than > 2 minutes on my system. tcpdump shows frequent wait periods, where no > packets get sent for a 40ms period. Thank you for this analysis. > > Add explicit (un)corking when processing (and responding to) requests. > "TCP_CORK, &zero" after earlier "CORK, &one" will flush pending data. > > VM Boot time: > main: no tls: 23s, with tls: 2m45s > patched: no tls: 14s, with tls: 15s > > VM Boot time, qemu-nbd vi...

...>>> >>> __________________________________________________ >>> >>> Please consider the environment before printing this email. >>> Ger Hooton >>> Systems Administrator >>> Scoil Chro? ?osa Blarney. >>> Blarney. >>> Co. Cork >>> >> >> > > __________________________________________________ > > Please consider the environment before printing this email. > Ger Hooton > Systems Administrator > Scoil Chro? ?osa Blarney. > Blarney. > Co. Cork > _____________________________...

...hey ; turn off their phones when they dont want to read member => IAX2/100 Yet sadly it still doesn't join them. Have I forgotten anything? Thanks David -- _________________________________________ Mr. David Anthony O'Reilly, M.Sc, B.Sc Researcher @ MISL Group, University College Cork (Current) M.Sc MOB Postgraduate @ University College Cork - M.Sc (Mobile Networking and Computing) - 2009 Computer Science Graduate of The University of Dublin, Trinity College - B.Sc (Computer Science) 2008 Email: oreillda at tcd.ie / dor3 at student.cs.ucc.ie ___________________________...

dovecot-v1.0-alpha build failed for Solaris 11 (OpenSolaris Nevada). The problematic line is in socket.c line 228. The fix should be to change SOL_TCP to IPPROTO_TCP found in netinet/in.h. This change should work universally on all platforms. Gary

I am trying to move from IAX2 to SIP for voipbuster, moving at the same time to sip1.voipbuster.com. When I try calling out, I see that there is SIP exchange, and in many cases also RTP data being exchanged. Hover in a very large number of attempts the connection is not established. Half of the time there is no RTP, the rest of the time there *is* RTP data flowing in two ways, but no ringtone is

...root root 10 Jul 5 11:07 dm-name-cs_uews027-home -> ../../dm-2 > > > It's looks like that I am not doing the disk drive stuff in the config file correctly. > > > -- > > Gerard Hooton. > Senior Technical Officer > School of Engineering. > University College Cork. > College Road. > Cork. > Ireland. > Loc8: WDR-04-60G > Tel: +353 21 4902296 > Mobile: +353 852813491 > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos -- Stephen J Smo...

...d+NKs4k>: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x8e09e) [0x7efd1d3a309e] -> /usr/lib/dovecot/libdovecot.so.0(+0x8e18c) [0x7efd1d3a318c] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7efd1d34169e] -> dovecot/imap [hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked](+0x1ad42) [0x55649b35cd42] -> dovecot/imap [hildeb 141.42.206.36 UID FETCH - 8192 bytes waiting corked](client_output+0x118) [0x55649b35ce68] -> /usr/lib/dovecot/libdovecot.so.0(+0xaf370) [0x7efd1d3c4370] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x4c) [0x7efd1d3b715c] -&gt...

...sion 3.2.5 configured for Windows Domain login. It was working fine until I moved over to ldapsam. Now when I login to the XP client I don't see the logon drive (X: in my case) Any debug tips? //Ger -- Gerard Hooton Systems Administrator Blarney Boy's National School, Blarney. Co. Cork

...Alva Clarke, Dublin, Ireland 32. Daragh Malone, Dublin, Ireland 33. Robert mulvaney,Co.Meath,Ireland 34. Sean Lynch, Meath, Ireland 35. Julieann Boland, Meath, Ireland. 36. Pamela McGann, Meath Ireland 37. Denise McDonnell, Mayo Ireland 38. Alan Barry, Waterford, Ireland 39. Eimear O'Halloran, Cork, Ireland 40. Ann Marie Lynch, Cork, Ireland 41. Michael Ruane, Cork, Ireland 42. Rob O'Hea, Cork, Ireland 43. Steven Kelly, Cork Ireland 44. Noreen Coakley, Cork Ireland 45. Vivienne Harris, Cork Ireland 46. Ger War, Cork Ireland 47. Mairead O'Brien, Cork, Ireland 48. Robert Copperwhite, Co...

...but should it be 11:59 or 12:00 and ifTime(12:00-18:00|*|*|*) { -- should it be from 12:01 However doing that I assume will miss a minute. Anybody know :) D -- _________________________________________ Mr. David Anthony O'Reilly, M.Sc, B.Sc Researcher @ MISL Group, University College Cork (Current) M.Sc MOB Postgraduate @ University College Cork - M.Sc (Mobile Networking and Computing) - 2009 Computer Science Graduate of The University of Dublin, Trinity College - B.Sc (Computer Science) 2008 Email: oreillda at tcd.ie / dor3 at student.cs.ucc.ie Tel: +353 (0) 86 030 60 32 _...

Hi All, I cannot get the sieve_before to work. I have dovecot & sieve installed on Debian 7 as follows /etc/dovecot/conf.d/90-sieve.conf : plugin { # The path to the user's main active script. If ManageSieve is used, this the # location of the symbolic link controlled by ManageSieve. sieve = ~/.dovecot.sieve # The default Sieve script when the user has none. This is a path to a

This time around, the numbers are indeed looking better than in v1; and I like the interface better. Eric Blake (2): server: Prefer send() over write() server: Group related transmission send()s server/internal.h | 7 +++- server/connections.c | 51 +++++++++++++++++++++++++--- server/crypto.c | 11 ++++--

...2023 at 02:41:20PM -0500, Eric Blake wrote: > On Fri, Mar 24, 2023 at 11:47:20AM +0100, Florian Westphal wrote: > > qemu-nbd doesn't set TCP_NODELAY on the tcp socket. Replying to myself, WHY aren't we setting TCP_NODELAY on the socket? > > And surprisingly, qemu IS using corking on the client side: > https://gitlab.com/qemu-project/qemu/-/blob/master/block/nbd.c#L525 > just not on the server side, before your patch. Corking matters more when TCP_NODELAY is enabled. The entire reason Nagle's algorithm exists (and is default on unless you enable TCP_NODELAY) i...

...weeks :) Changes: - Fixed maildir syncing errors about wrong UIDs - Maildir was re-read all the time, even if we knew nothing had changed there - SSL/TLS connections used to have extra ~0.2s latencies because kernel was waiting for more data before sending it (at least with Linux). Fixed it by corking/uncorking before/after sending. I don't think the socket latencies are this bad normally though, I should probably look more into it if we're setting some socket flags badly (or does it happen specifically because we were using corking for the socket before SSL and kernel increased the t...

...uD7jVe4UPzZm2qRLLXI -> ../../dm-2 lrwxrwxrwx. 1 root root 10 Jul 5 11:07 dm-name-cs_uews027-home -> ../../dm-2 It's looks like that I am not doing the disk drive stuff in the config file correctly. -- Gerard Hooton. Senior Technical Officer School of Engineering. University College Cork. College Road. Cork. Ireland. Loc8: WDR-04-60G Tel: +353 21 4902296 Mobile: +353 852813491

...ith as low a delay as possible (many clients > don't care, but some do). That's why we use TCP_NODELAY - we > actually WANT to send out data as soon as we can. Nagle is inherently unsuited for streams. NODELAY was (imho) ment for connections for which Nagle isn't sufficient and CORK is not an option, i.e. telnet. Sending the data as soon as you can might not be the way to go, since this has the potential to raise overhead significantly. I can explain this best by grossly exxagerating, suppose i have an application that sends out 1 byte at a time. Using NODELAY this would resu...